Casio DW-6620 / DW-6640 Manual — Module 1209

Three owner's manual PDFs for the Casio module 1209, each a different scan (English included). Casio fitted it in the DW-6620 and DW-6640. Casio's spec sheet lists one MCR2016, with 2 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Aug 1995.