Casio DW-003 / GT-001 Manual — Module 1698

Four owner's manual PDFs for the Casio module 1698, each a different scan (English included). Casio fitted it in the DW-003, GT-001, and GT-003. 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 Feb 1998.