Casio GT-005 / GT-005B Manual — Module 1835

Three owner's manual PDFs for the Casio module 1835, each a different scan (English included). Casio fitted it in 5 models, including the GT-005 and GT-005B — the full list is below. Casio's spec sheet lists one CR2016, with 18 months of battery life and accuracy within ±15 seconds a month; the module first shipped in Jun 1998.