Casio DWX-100 / DWX-101 Manual — Module 1978

Two owner's manual PDFs for the Casio module 1978, each a different scan (English included). Casio fitted it in 9 models, including the DWX-100 and DWX-101 — the full list is below. 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 Dec 1998.