Owner manual / German
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Casio Module 331 Manual
One owner's manual PDF for the Casio module 331 (German only). Casio's spec sheet lists one 379, with 2 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Dec 1985.
Module specs
Battery: 379 (silver-oxide)
Rated battery life: 2 years
Rated accuracy: ±15 sec/month
Casio service manual ref: S/M-183
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