Owner manual / German
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Casio Module 323 Manual
One owner's manual PDF for the Casio module 323 (German only). Casio's spec sheet lists one 371, with 18 months of battery life and accuracy within ±15 seconds a month; the module first shipped in Feb 1984.
Module specs
Battery: 371 (silver-oxide)
Rated battery life: 18 months
Rated accuracy: ±15 sec/month
Casio service manual ref: S/M-151
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