Casio DW-8010G / DW-8040 Manual — Module 1431

Three owner's manual PDFs for the Casio module 1431, each a different scan (English included). Casio fitted it in 5 models, including the DW-8010G and DW-8040 — the full list is below. 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 May 1995.