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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: Watch4me - Replies: 12 - Views: 5255
The early Seiko Quartz calibers explained
Seiko's early quartzes can be downright intimidating, what do all these numbers and letters mean? Well, after some years of doing my research I can finally say with confidence what's what. 
As of 1971 The '38' movements were Seiko's first widely available quartz movements, but first was the 1969 Seiko Quartz Astron (100 or so made) representing a groundbreaking technological breakthrough. 

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The watch’s tuning-fork-shaped quartz oscillator gave the Astron’s movement, Calib
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: Collectionist - Replies: 0 - Views: 326
Seiko Quartz calibers Photo gallery