Owner manual / English
OLD WATCH SHOP
Casio Module 1628 Manual
Two owner's manual PDFs for the Casio module 1628, each a different scan (English included). Casio's spec sheet lists one CR2016, with 2 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Mar 1998.
Module specs
Battery: CR2016 (lithium)
Rated battery life: 2 years
Rated accuracy: ±15 sec/month
Casio service manual ref: S/M-589
Open Casio battery finder