Casio AW-21 U / AW-21U Manual — Module 387

One owner's manual PDF for the Casio module 387 in English. Casio fitted it in the AW-21 U and AW-21U. Casio's spec sheet lists one SR1120W, with 2 years of battery life and accuracy within ±20 seconds a month; the module first shipped in Dec 1989.

Module details

Brand: Casio

PDF files: 1

Released: Dec 1989

Mapped models: 2

Module specs

Battery: SR1120W (silver-oxide)

Rated battery life: 2 years

Rated accuracy: ±20 sec/month

Casio service manual ref: S/M-319

Open Casio battery finder

Owner manuals

Owner manual / English

PDF

419 KB

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Watch models using this module

Model	Released
AW-21 U	1989
AW-21U	1990