Owner manual / English
OLD WATCH SHOP
Casio DB-31 / DB-31-1Z Manual — Module 871
Two owner's manual PDFs for the Casio module 871, each a different scan (English included). Casio fitted it in the DB-31, DB-31-1Z, and DB-33W. Casio's spec sheet lists one CR1616, with 5 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Nov 1988.
Module specs
Battery: CR1616 (lithium)
Rated battery life: 5 years
Rated accuracy: ±15 sec/month
Casio service manual ref: S/M-291
Open Casio battery finderWatch models using this module
| Model | Released |
|---|---|
| DB-31- AKA [Telememo] | 1987 |
| DB-31-1Z | 1987 |
| DB-33W | 1993 |
