Casio DW-003 / DW-004 Manual — Module 1597

Two owner's manual PDFs for the Casio module 1597, each a different scan (English included). Casio fitted it in the DW-003 and DW-004. 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 Feb 1997.