|
Magnetic resistance performance
|
Magnetism resistance
(in case of direct current magnetic field)
|
|
Type 1 antimagnetic watch
(magnetic resistant watch)
|
Up to 4,800 A/m
A magnetic resistant watch almost always maintains its performance when placed at 5 cm from magnetic field generating devices of everyday life.
|
|
Type 2 antimagnetic watch
(super magnetic resistant watch)
|
Up to 16,000 A/m
A super magnetic resistant watch almost always maintains its performance when placed at 1 cm from magnetic field generating devices of everyday life.
|
Cal 9051 -- -831 Mechanical --
I found this information on the site listed below.
Seiko Site
https://www.seikowatches.com/jp-ja/customerservice/operation_care/impact
Citizen site
https://citizen.jp/core-
https://www.numatakouki.com/
Since it is not possible to provided detailed information, so the listed information may vary.
Please use the information as a reference only.
]]>This piece has a minuscule 5 second time reading error throughout the year. The high precision of Citizen was made to perfection with Quartz.
One of the first points taken was not consideration was the quartz oscillators.
The crystal oscillators act like a quartz heart in this piece.
The wavelengths of the crystal oscillators are monitored for 6 months, upon which those with stable frequencies are selected.
Furthermore, the wavelengths are continuously monitored after pairing it into the movement, and any inadequate ones are removed.
This is how they achieve an error margin of 5 seconds.
Another appealing feature is the frequency temperature compensation function, since temperature has the greatest affect on quartz accuracy.
Quartz, which functions properly at 25C, will experience a daily delay of 0.1 seconds with a 5C temperature difference.
That is why The Citizen comes equipped with the frequency temperature compensation function.
It measures the temperature and makes adjustments 1 minute beforehand.
The frequency temperature compensation continues to function even with frequent temperature changes.
A wristwatch boasted as the jewel of Japan; this is The Citizen.
Refer to
https://citizen.jp/the-citizen/special/philosophy/precision.html
There are times when the second hand doesn’t quite hit the marker.（second hand mis-alignment）
I have received many questions regarding this from several customers asking why this was happening. I found an easy-to-understand explanation on the Citizen watch site, so I am posting a summary of it.
The second hand’s movement is controlled by the gears. There is an intentional space placed in-between each gear. That space(playfully) is called "backlash". This backlash is the cause of the second hand mis-alignment The gear space causes the place where the second hand stops to slip a little.
An adequate backlash is essential for smooth gear operation. To put it quite simply, the gears would stop turning if the backlash was too small.
The reasons for the necessity of an adequate backlash are outlined below.
１．Thermal expansion
The gears expand due to the heat from friction. A difference of just 10C can have an affect on gear alignment, even if they are small. The backlash is essential in minimizing that affect.
2. Distortion
The gears of a watch take on pressure as they mov, causing these small parts to become slightly distorted. The backlash is necessary to minimize distortion.
3. Impact
Watches are sometimes dropped. The will cause the gears to break upon direct impact if there isn’t a bit of slack.
4. Wear resistance
By creating a backlash, it is easier for lubricant to get up into the gears、preventing abrasion.
5．Parts Standardization
The parts in a watch are not all exactly the same size, strictly due to error, despite an increase in machining accuracy.(Of course this is within the acceptable range for the maker).In order to account for this error, it is important to put the backlash into place to ensure that all parts turn smoothly..
（This might be the main reason.）
In conclusion
The Backlash is an essential part of the gear, and can’t be removed 100%.
While it is possible to reduce the backlash by improving the gear manufacturing precision and assembly method, doing so would have an impact on thermal expansion, impact, and wear resistance etc.
In other words, an adequate backlash is the solution for balancing durability, accuracy, and refined hand movement within the watch.
That is all of the available information from the Citizen watch site.
References:
Citizen watch site (Japanses)
https://citizen.jp/support/useful/lag01.html
Picture : Wikipedia
https://en.wikipedia.org/wiki/Backlash_(engineering)
The rest is what I have been able to determine speaking from personal experience.
SEIKO has come out with Backlash auto-adjust mechanism, which they use in the Grand Seiko Quartz for reducing second hand mis-alignment.
The Grand Seiko Quartz uses the power of the spring to reduce the slight second hand mis-alignment that is created by the backlash as much as possible. (It’s like stopping the motion of a moving object with the power of a spring, which is difficult to wrap my head around.)
Even though the misalignment is far less noticeable in Grand Seiko is n comparison to any other watch, even the meticulously crafted Grand Seiko suffers from a slight second hand mis-alignment. (Sorry SEIKO)
About SEIKO Backlash auto-adjust mechanism,
https://www.grand-seiko.com/au-en/special/9f9s9stories/vol3/2/
Seiya Kobayashi
]]>
You can view its history of self adjustment records to view time zone corrections via radio waves and Bluetooth.
The amount of energy generated by the solar cell of the watch is displayed.
It updates with the latest time zone and summer time information from each country.
It searches for your smartphone.
Production of the new 4S caliber
Seiko formed an in-house mechanical watch project team due to the
positive response received from the 6810 UTD series.
But no engineer with experience in mechanical caliber design was
available in a company.
So, the new caliber, 4S35 was decided to manufacture based on the old
52 caliber, which was produced 20 years ago.
The 52 caliber prided itself on precision of the 1970’s Chronometer standard.
At last, 200,000 4S calibers were produced. Seiko understood it was
too many. However, manufacturing new caliber costs a lot. Seiko had to
make 200, 000 calibers.
The first watch fitted with the 4S was on sale at the end of 1992.
It was SCVK001 (4S35-8000) with 4S35 caliber.
Mechanical watches became the focus of attention in the media.
This boosted Grand Seiko’s mechanical type revival.
Tanaka wanted to create new Grand Seiko with new high-end caliber. But
because there were too many 4S caliber surplus, company didn't want to
develop new caliber.
As Seiko had to keep to use 4S calibers, they made mechanical watches
like "Credor Chronometers GBAY992”, "KING SEIKO 2000 repro model", Laurel, and SUS with 4S calibers.
Grand Seiko’s mechanical type revival
Some years later, Seiko began to produce new Grand Seiko with new
mechanical caliber. It was 1996.
A young engineer, Jujo Kouichiro tried to fine-tune 4S calibers for new Grand
Seiko first. But he soon understood it was impossible. Because Grand
Seiko needs more precision accuracy.
Each and every retired technical expert was interviewed in order to
form the new movement.
Many test products were developed by utilizing 3D CAD computer
technology. The precision and structure of the test products were
redone over and over again by ”Ohira Akira”, allowing the completely new movement to be
completed in just 2 short years.
(Please search ”Ohira Akira” by Google)
The Grand Seiko SBGR001 mechanical type was revived on November 27, 1998.
seiyajapan.com
]]>I have an announcement to make.
Citizen has ceased to provide instructions for their wristwatch lineup.
Their instructions have been made available online.
They are available in English, French, Spanish, German, Italian, Portuguese, and Chinese.
They can be printed, but it will use up a lot of paper, so please print only the necessary pages.
Seiya.K
]]>
There aren’t any available photos, and details are subject to change.
But I still can’t wait for it to come out.
SBDC091
Green dial + Brown leather strap -- 75000 Yen
SBDC089
White dial + Black leather strap -- 75000 Yen
SBDC087
Black dial + SS bracelet -- 77000 Yen
SeiyaJapan.com
]]>
Grand Seiko was only sold within Japan when it went on sale. So this watch was made for Japanese people.
The curved case differs from the typical flat and straight lines of the recent Grand Seiko.This design was also in style at the time.
Made by 1010Tock
Instagram - @1010_Tock
She won the all-American open two weeks after contracting as a brand ambassador for Citizen wrist watches.
This is very fortunate for Citizen.
CITIZEN BRAND AMBASSADOR Naomi Osaka
Naomi Osaka's U.S. Open Victory Earns Citizen Watch Bonus
Now, Citizen’s Osaka Naomi model BZ4006-01E was sold out due to its popularity and will be unavailable until February of next year, even though it’s not a limited edition.
Therefore Citizen Naomi Osaka model is not on my site :-(
seiyajapan.com
]]>
http://www.seiko-watch.co.jp/spirit/giugiaro/
Ayrton Senna Rally car test day1986
Source Web http://www.forocompeticion.com/foro/rally-internacional/8573-ayrton-senna-rally-driver.html
Ayrton Senna and Nelson Piquet race track at Rio de Janeiro -. 1986 (Jorge Meditsch)
Source Web http://robertacarrilho-div.blogspot.jp/2014/03/meu-tributo-ayrton-senna-porque-hoje-e.html
19. Ayrton Senna e Nelson Piquet no autódromo de Jacarepaguá, Rio de Janeiro – 1986. (Jorge Meditsch)
Ayrton Senna ride his bicycle at home
Source Web http://robertacarrilho-div.blogspot.jp/2014/03/meu-tributo-ayrton-senna-porque-hoje-e.html
18. Ayrton Senna em sua casa – 1986. (Lemyr Martins)
]]>
Corresponding models
My grandfather was a soldier in the military, and always carried a Japanese sword.
When I sought the expert opinion of a specialist, they told me it was more than 400 years old.
-I have no way of knowing if that is actually true or not.
I have never been in any big misfortunes up to now, and have led a relatively
happy life.
I feel like I have been blessed like this because the sword watches over me.
Needless to say, this wristwatch is my treasure.
It is the cornerstone of my work.
Thanks to this watch, I have met countless people that I would never have had the chance to otherwise.
I met a lot of people from abroad, which expanded my world.
Also, whenever I face any sort of trials or tribulations... or simple tests, I always wear my wristwatch.
For example, I wore my wristwatch the other day during an English test.
I feel that wearing it helped me bring my A game.
When I hospitalized for a month, one of my watch enthusiast friends living abroad gathered funds from everyone, and sent it to me as as a "get well soon" gesture.
They all lived in different countries, and have never met me in person.
They are all watch enthusiast friends that talk to me on an internet forum.
Following their lead, others chipped in, and raised the funds for it.
I was rather surprised when I found out about it, and was deeply touched by their gesture of friendship.
I really love this pen, and use it all the time.
I feel like I get all sorts of great ideas when I use this pen.
SeiyaJapan
]]>
It was the same when I worked as a production manager for a TV commercial and film company. I didn’t really care for it, though. I valued my free time more.
One night, at one such drinking party, my boss caught a glimpse of my watch from under my suit, and complimented me by saying “That’s a nice watch you have there.”
I suddenly saw that boss in a whole new light.
Then , he allowed me to work on the Seiko wristwatch TV commercial and film production team as a part of the staff.
The flow of time was compared to the Sumida River that flows through Tokyo. The catchphrase for those commercials was “Analog is the flow of time”.
Time literally flew by for me as well when I was working on those projects.
For me, they are my fondest memories from working for that TV commercial and film production company.
I can’t seem to find that commercial anymore.
This is a commercial that I was in charge of when I was young.
It brings back a lot of memories.
]]>
The same model as the SEIKO watch that I sold on ebay.com first.
My dad bought me a digital wristwatch when I entered high school.
I remember it making me feel really happy.
The first time I scratched it, it really bothered me, and I got a little depressed by the scratch.
That chronograph on that watch was accurate to 1/100 of a second.
I played with it by stopping the stopwatch at exactly 5'00"; it made a great pasta timer.
I didn't really use it for anything else aside from that, but the chronograph was exciting to me just by doing that.
It was by my side through university exams, employment exams, dates with girls, but I ended up losing it one day.
I found another one on Yahoo auction the other day. It cost less than $10 USD including shipping. The light doesn't work, but everything else works without issue.
It was a bittersweet reunion.
]]>
Packaging methods will vary depending on the watch box, but this is out standard packaging method.
seiyajapan.com
]]>
http://www.ebay.com/itm/302232063516
After listing an item, even though I tried to be rather careful, I noticed the product name was somehow listed as GWF-1000RD even though the correct name was GWF-1000SR.
I took down the listing in order to fix it, but....
I forgot to select "Cancel bids and end listing early".
Ahh!!!
I was able to successfully sell it to a $300 bidder,... but I thought it would sell for a little more.
seiyajapan
]]>
Seiko performed a diving demonstration experiment on the SEIKO 1000m diver's watch in cooperation with JAMSTEC. (JAMSTEC: Japan Agency for Marine-Earth Science and Technology)
JAMSTEC's Kaiko 7000 lives up to its as an unmanned probe by that can explore 7000m into the deep sea.
http://www.jamstec.go.jp/e/about/equipment/ships/kaiko7000.html
After careful preparation, the test begins.
It cleared a depth of 1000m without any problems. It goes down further to 2000m, then 3000m.
At 3000m, the back cover starts to give in, but the watch continues working.
The second hand on the 1000m Quartz stopped at 3,284m.
The glass cracked at 4,804m.
The second hand on the 1000m Automatic stopped at 4,299m, and the glass cracked at 5,993m.
There are no images of the cracked glass in this video.
A while after the experiment, I saw the watch that had been used in this experiment on display in a watch shop I happened to stop in at.
The shattered glass and severely dented back cover, which were unpublished in the video, tell the story of the severity of this experiment.
It is an amazing watch.
SBBN013 & SBDX011 were out of production models now.
Current models
Quartz Model SBBN013 Change to SBBN025
Automatic Model SBDX011 Change to SBDX013
Click Here
SEIKO Diver's Watch Site
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Appearance
It changed over to a see-through back. (As you already know)
The crown got bigger, making it easier to use.
The date font was made thicker, making it easier to see.
The bottom of dial words (Japan 9Sxx-00X0) were made thicker.
The decorations on movement were also changed.
The Magic Lever System has few parts, making it exceedingly durable. Winding up the 55 hour main spring was more than efficient.
*About magiclever
Winding up the 72 hour main spring made me realize that the magic lever system has its limits.
It switched over to the reversing pawl wheels system (is this name right?), which has an efficient winder. The Reverse wheel was made more compact to increase efficiency, and treating the watch with hard coating increased durability.
*About Reverser
https://watchmakingjourney.com/2015/10/09/automatics-eta-2824-2/
The winding gears were rechecked, and were made more efficient by going back to using jewel bearings. That is why the number of jewels increased from 26J to 35J
The length of the main spring (Spron510) was lengthened to 10 cm compared to the 9S55, it was widened by 0.5 mm, and it switched over to the 72 hour power reserve. (The main spring was thinned out by 0.2 mm to make it more compact).
The 9S55 spring is 40 cm long and 0.12 mm thick.
The 9S65 spring is 50 cm long and 0.10 mm thick.
http://www.seiko-cleanenergy.com/watches/mechanical-1.html
The "Spron610" was used as materials for the hairspring. This doubled the shock resistance and tripled the anti-magnetization.
http://www.webchronos.net/special/2010/04/50_vol8/index.html
The balance wheel mortice was changed from 0.07 mm to 0.08 mm to increase durability.
The gears were given a hard coat finish, and some gears were gold-plated with low abrasion resistance to aim for accuracy, making them more durable.
References
http://www.webchronos.net/sp/2012/06/gs_3/
http://www.webchronos.net/special/2010/04/50_vol8/index.html
http://www.seiko-cleanenergy.com/watches/mechanical-1.html
]]>
The train conductors are responsible for always keeping a watchful eye on the front of the train. That is why they use Seiko's railway watch, which is bigger than a wristwatch, has easy to see numerals, and can always be set into the same spot.
The time on this railway watch is correctly adjusted by the crew in front of a supervisor.
The watch often falls and gets hit since the driver's seat sways a lot. That is why it is made of hard-to-break acrylic. It would easily crack and shatter if it used glass.
The driver's seat is subjected to a lot of magnetism, so they can't use a radio watch. If a radio watch were to be affected by the magnetism during reception, then it would not be able to receive signals correctly.
Even quartz is weak against strong magnetism, so it is made with stronger anti-magnetic
Regular Antimagnetic Watch
MAGNETIC RESISTANT 4800A/m = 60 Gauss
Seiko Railway Watch
MAGNETIC RESISTANT 16000A/m = 200 Gauss
Grand Seiko Quartz
SBGX091 SBGX093 40,000 A/m= 500Gauss
Grand Seiko Automatic
SBGR077 SBGR079 80,000 A/m= 1000Gauss
Rolex Milgauss
80,000 A/m. = 1000Gauss (This is in a league all of its own, which is pretty impressive.)
| Type | Magnetism resistance (in case of direct current magnetic field) |
Explanation |
| Common timepiece |
Up to 1,600 A/m (approx. 20 gauss) |
The minimum magnetism resistance requirement for a watch. (For reference) |
|
Type 1 antimagnetic watch (magnetic resistant watch) |
Up to 4,800 A/m (approx. 60 gauss) |
A magnetic resistant watch almost always maintains its performance when placed at 5 cm from magnetic field generating devices of everyday life. |
|
Type 2 antimagnetic watch (super magnetic resistant watch) |
Up to 16,000 A/m (approx. 200 gauss) |
A super magnetic resistant watch almost always maintains its performance when placed at 1 cm from magnetic field generating devices of everyday life. |
Information source
Interview
East Japan Railway Company
Reference URL
Japan Clock & Watch association
http://www.jcwa.or.jp/time/qa/qa-r06.html
http://www.jcwa.or.jp/en/time/qa/qa10.html
Adjuster, Pliers, little container, Small plastic bag
Parts often go missing when doing this, so it is best to have a little container to put the parts in. Also keep a bag handy to keep leftover parts in.
Removing the clasp makes things go smoother. Make sure to double check the direction of the arrow on the bracelet, and remove the pin with the adjuster.
Don't put any more pressure on it than necessary. When you are unable to push the pin out, check to make sure that the adjuster pin is straight, and check the position from both the top and from the side.
Use pliers when you are unable to remove the pin. (Make sure not to scratch the bracelet).
Follow the above steps to remove the pin and collar. Be careful not to lose any parts. (Put them into the little container that you set aside for the parts).
Remove the other piece as well.
Put the collar into the hole (Make sure to check the direction of the arrow on the watch bracelet back.)
Place the pin into the bracelet hole.
Push the pin into place. (It is also possible to push it into place with an adjuster). Make sure not to force the pin into place, or the pin may break. Move the parts against each other a little, and find a spot where it will go in smoothly.
Put the clasp back into place and you are finished. Keep removed parts, collars, and pins in a bag and hang onto them.
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