seiko_39
Differences
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— | seiko_39 [02.12.2022 20:38] (current) – created - external edit 127.0.0.1 | ||
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+ | ====== Seiko 39 ====== | ||
+ | Seiko' | ||
+ | |||
+ | ===== History ===== | ||
+ | [[Seiko]] was quietly racing to develop a [[quartz watch]] movement in the 1960s, and delivered their first [[Seiko 35|Cal. 35]] movement to the [[Neuchatel Observatory]] in late [[1967]], just a few months after the [[CEH]] delivered their [[Beta 21|" | ||
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+ | Daini' | ||
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+ | The design of the movement is extremely unusual, using an electro-mechanical [[escapement]] rather than a [[stepper motor]]. Two large coils alternately pull a jeweled finger once per second, with a simple lever also used to prevent backlash of the seconds hand. This design is reminiscent of some of the earlier [[CEH]] [[Beta 21|Beta series]] movements as well as the [[Bulova Accutron]] and other contemporary electro-mechanical movements designs. It is entirely unlike any later quartz movement. | ||
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+ | Cal. 3922 was released first, adjusted to [[Seiko VFA|VFA]] accuracy of +/- 10 seconds per month. Introduced in November [[1972]], this movement was sold alongside the similar [[Seiko 38|Cal. 3823]] in the " | ||
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+ | Cal. 3923 appeared in [[1973]] using the 39SQW name. This movement featured a day wheel in addition to the date wheel found on Cal. 3922. Both movements are featured in Seiko' | ||
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+ | These movements were produced through [[1976]], after which they are removed from the Seiko catalog. By this time, they were superseded by more advanced movements that were thinner, more efficient, and cheaper. And no watch again would include the flashing LED. | ||
+ | |||
+ | ===== Variants ===== | ||
+ | * 3922/3923 (1971-1976) - "Seiko SQ" line | ||
+ | * 3922 - 39SQ - date | ||
+ | * 3923 - 38SQW - day/date | ||
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+ | |||
+ | <WRAP ud ud_mov> | ||
+ | |||
+ | **Description: | ||
+ | * [[Quartz]] movement with electromagnetic pawl | ||
+ | |||
+ | **Functions: | ||
+ | * Hours, minutes, central seconds | ||
+ | * [[Date]] and optional [[day]] | ||
+ | * Flashing [[LED]] | ||
+ | |||
+ | **Data:** | ||
+ | * ? [[jewels]] | ||
+ | * ? Hz | ||
+ | * [[CMOS]] [[integrated circuit]] | ||
+ | * [[Stepper motor]] | ||
+ | |||
+ | **Production period:** | ||
+ | * [[1971]]-[[1976]] | ||
+ | * Predecessor [[Seiko 36|Seiko 36]] | ||
+ | * Successor [[Seiko 48|Seiko 4883 " | ||
+ | </ | ||
+ | |||
+ | {{tag> | ||