Casio DW-5700C-1V / DW-5800 Manual — Module 691

Two owner's manual PDFs for the Casio module 691, each a different scan (English included). Casio fitted it in the DW-5700C-1V, DW-5800, and DW-5600C-9B. Casio's spec sheet lists one CR2320, with 7 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Jul 1987.