seiko_41
Differences
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+ | ====== Seiko 41 ====== | ||
+ | Seiko' | ||
+ | |||
+ | ===== History ===== | ||
+ | [[Seiko]] was raced 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|" | ||
+ | |||
+ | In [[1974]], Suwa Seikosha released Cal. 41, a volume production quartz ladies watch movement. This was a modern movement designed similarly to the contemporary [[Seiko 38|Cal. 38]], also from Suwa. Cal. 41 was smaller overall, with a semi-tonneau shape that fit in narrow watches. It measured 19.4 mm diameter at the widest, and was 3.8 mm thick for the smallest examples, which lack a seconds hand. This gave Seiko bragging rights for producing "The World' | ||
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+ | Like modern quartz movements, it used a 32 KHz [[quartz]] crystal and [[stepper motor]] actuating every second when equipped with a seconds hand or every five seconds otherwise. They are fitted with a trimmer condenser to adjust the rate, and are specified at less than 15 seconds variance per month. They also include a special [[thermocompensation|temperature-sensitive condenser]] to adjust to temperature variations. Battery life is better than 1 year. | ||
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+ | The movement is designed to be easily serviceable with replaceable components The coil block and circuit block can be swapped out, and are often replaced during servicing with upgraded types. | ||
+ | |||
+ | ===== Variants ===== | ||
+ | * 4100A - Time-only, 4.0 mm thick, 3 jewels | ||
+ | * 4110A - Time-only, no seconds hand, 3.8 mm thick, 2 jewels | ||
+ | * 4120 - Time-only, mainstream watches | ||
+ | * 4122 - Date, mainstream watches | ||
+ | * 4130A/4130B - No seconds hand, high-end watches | ||
+ | |||
+ | |||
+ | <WRAP ud ud_mov> | ||
+ | |||
+ | **Description: | ||
+ | * [[Quartz]] movement | ||
+ | |||
+ | **Functions: | ||
+ | * Hours, minutes, central seconds | ||
+ | * Optional [[date]] | ||
+ | |||
+ | **Data:** | ||
+ | * 2 or 3 [[jewels]] | ||
+ | * 32 KHz | ||
+ | * 19.4 mm diameter | ||
+ | * 3.8 or 4.0 mm thick | ||
+ | |||
+ | **Production period:** | ||
+ | * [[1974]]-[[1977]] | ||
+ | * Predecessor [[Seiko 03]] | ||
+ | </ | ||
+ | |||
+ | {{tag> | ||
seiko_41.txt · Last modified: 02.12.2022 20:38 by 127.0.0.1