Owner manual / English
OLD WATCH SHOP
Casio A-300W / W-50U Manual — Module 643
One owner's manual PDF for the Casio module 643 in English. Casio fitted it in 4 models, including the A-300W and W-50U — the full list is below. Casio's spec sheet lists one CR1616, with 2 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Jun 1987.
Module specs
Battery: CR1616 (lithium)
Rated battery life: 2 years
Rated accuracy: ±15 sec/month
Casio service manual ref: S/M-246
Open Casio battery finderOwner manuals
Watch models using this module
| Model | Released |
|---|---|
| A-300W | 1986 |
| W-50U | 1986 |
| A300U- AKA [WORLD TIME] | 1987 |
| W-520U | 1988 |
| W-520U- AKA [WORLD TIME] | 1988 |
