Casio DW-003 / DWM-100 Manual — Module 1662

One owner's manual PDF for the Casio module 1662 in English. Casio fitted it in the DW-003 and DWM-100. Casio's spec sheet lists one CR2016, with 18 months of battery life and accuracy within ±15 seconds a month; the module first shipped in Jul 1997.