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Author: Collectionist - Replies: 1 - Views: 1776
The twin quartz calibers of the seventies
When quartz was well established, at the end of the Seventies, the Seiko 1978 JDM catalogue showed the twin quartz caliber for the first time, however there were (eventually) at least three different design technologies behind the Seiko twin quartz models.
[color=black][size=medium][font=Times]While quartz based watches are extremely accurate compared to mechanical watches th
Author: Collectionist - Replies: 1 - Views: 1732
The twin quartz calibers of the seventies
When quartz was well established, at the end of the Seventies, the Seiko 1978 JDM catalogue showed the twin quartz caliber for the first time, however there were (eventually) at least three different design technologies behind the Seiko twin quartz models.
[color=black][size=medium][font=Times]While quartz based watches are extremely accurate compared to mechanical watches th
Author: jpfwatch - Replies: 5 - Views: 2199
Twin Quartz Seiko Grand Quartz 9943-8030
Watchmaker Jan Ubels doesn't need any recommendation on this website, but I have to say I am really impressed by his work.

These are the before pictures:
https://www.watchiwant.com/showthread.ph...35#pid1535

Pictures from the seller:
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After pictures (it was already dark..):
[attachment=5182]
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[attachment=5184]

in the weekend I will take more pictures en tell what has been done to service the wat