Owner manual / English
OLD WATCH SHOP
Casio W-550 / 81CS-36 Manual — Module 81
One owner's manual PDF for the Casio module 81 in English. Casio fitted it in 9 models, including the W-550 and 81CS-36 — the full list is below. Casio's spec sheet lists one BR2320, with 5 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Jul 1979.
Module specs
Battery: BR2320 (lithium)
Rated battery life: 5 years
Rated accuracy: ±15 sec/month
Casio service manual ref: S/M-114
Open Casio battery finderOwner manuals
Watch models using this module
| Model | Released |
|---|---|
| 81CS-36 | 1978 |
| A-655 | 1978 |
| C-36 | 1978 |
| C-36 | 1978 |
| QS-33 | 1978 |
| 81QS-40- AKA [Lithium] | 1979 |
| 81QS-35 | 1980 |
| 81QS-35 | 1980 |
| A655 | 1980 |
| A655 | 1981 |
| W-550 | - |
| w-61- AKA [Sailboat] | 1984 |
