Owner manual / English
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Casio Module 501 Manual
Two owner's manual PDFs for the Casio module 501, each a different scan (English included). Casio's spec sheet lists one CR1216, with 5 years of battery life and accuracy within ±30 seconds a month; the module first shipped in Jan 1987.
Module specs
Battery: CR1216 (lithium)
Rated battery life: 5 years
Rated accuracy: ±30 sec/month
Casio service manual ref: S/M-229
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