Casio DW-004X / DW-004BD Manual — Module 1826

Five owner's manual PDFs for the Casio module 1826, each a different scan (English included). Casio fitted it in the DW-004X, DW-004BD, and DW-004SV. Casio's spec sheet lists one CR2016, with 1.5 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Nov 1997.