September 6th 2014
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.
Seiko Prospex Depth Testing Movie
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The shattered glass and severely dented back cover, which were unpublished in the video, tell the story of the severity of this experiment.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.
Quartz Model SBBN013 Change to SBBN025
Automatic Model SBDX011 Change to SBDX013
Edit : Seiya Kobayashi
Photo: Seiya Kobayashi
The first generation Grand Seiko SBGR001(Silver dial), SBGR023(Black dial)
The only difference between the SGBR001 (Silver dial) and SBGR023(Black dial) were the different dial colors.
All of the hands were finished with polish.
The second generation Grand Seiko SBGR051(Silver dial), SBGR053(Black dial)
The black dial on the SGBR053 was switched up by giving the hands and indexes a brushed finish.
The polished needle blacked out on the black dial depending on lighting conditions. This was improved on.
The beveling on the needle was a little bit deepened compare with the SGBR051 hands in order to make it easier to see against the black letter board.
However, there is no need to worry for those of you who own the SGBR001 and SBG023. The appearance hasn't changed, but the movement research on the 9S55 is progressing daily.
The hairspring setting has been adjusted, the gear accuracy has been improved on with an increased oscillating angle, and has been finely tuned. In the case of the OVH, the parts have been changed out, so that it can always be in best of Grand Seiko condition.
世界の腕時計 No.102 WORLD WRIST WATCH TIME SPEC No81
The SBGR001 evolved into the SBGR051 in 2010.
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.
It also was given a 72 hour power reserve.
1. Switching over to an Automatic Winding System
The Magic Lever System has few parts, making it exceedingly durable. Winding up the 55 hour main spring was more than efficient.
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.
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
2. Rethinking the Main Spring .
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.
1. Improving the Hairspring
The "Spron610" was used as materials for the hairspring. This doubled the shock resistance and tripled the anti-magnetization.
2. Improving the balance wheel
The balance wheel mortice was changed from 0.07 mm to 0.08 mm to increase durability.
3. Improving the gears
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.