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Casio GM-10 / GM-20 Manual — Module 165

One owner's manual PDF for the Casio module 165 in English. Casio fitted it in the GM-10 and GM-20. Casio's spec sheet lists one BR2016, with 15 months of battery life and accuracy within ±15 seconds a month; the module first shipped in Oct 1981.

Module details

Brand: Casio

PDF files: 1

Released: Oct 1981

Mapped models: 2

Module specs

Battery: BR2016 (lithium)

Rated battery life: 15 months

Rated accuracy: ±15 sec/month

Casio service manual ref: S/M-124

Open Casio battery finder

Owner manuals

Watch models using this module

ModelReleased
GM-101980
GM-20- AKA [GAME-20]1980

Watches in stock using this module

$629.10eBay $699.00
Rare Vintage Casio GM-10 Men’s Digital Game Watch JDM 1980s Module 165

Rare Vintage Casio GM-10 Men’s Digital Game Watch JDM 1980s Module 165

$742.50eBay $825.00
Rare Vintage Casio GAME-20 GM-20 Men’s Digital Game Watch JDM 1980s Module 165

Rare Vintage Casio GAME-20 GM-20 Men’s Digital Game Watch JDM 1980s Module 165

$899.10eBay $999.00
Rare Vintage Casio GAME-20 GM-20 Men’s Digital Game Watch JDM 1980s Module 165

Rare Vintage Casio GAME-20 GM-20 Men’s Digital Game Watch JDM 1980s Module 165

$495.00eBay $550.00
Rare Vintage Casio GAME-20 GM-20 Men’s Digital Game Watch JDM 1980s Module 165

Rare Vintage Casio GAME-20 GM-20 Men’s Digital Game Watch JDM 1980s Module 165