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Casio STW-100 Manual — Module 657
One owner's manual PDF for the Casio module 657 in English. Casio fitted it in the STW-100. Casio's spec sheet lists one CR1616, with 3 years of battery life and accuracy within ±15 seconds a month; the module first shipped in May 1988.
Module specs
Battery: CR1616 (lithium)
Rated battery life: 3 years
Rated accuracy: ±15 sec/month
Casio service manual ref: S/M-282
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Watch models using this module
| Model | Released |
|---|---|
| STW-100 | 1986 |
| STW-100- AKA [Sports Multi Timer] | 1986 |