Casio BGR-210V / BG-420S Manual — Modules 1850 / 2284

Two owner's manual PDFs for the Casio module 1850, each a different scan (English included). Casio fitted it in the BGR-210V and BG-420S. The same documents also cover module 2284. For module 1850, Casio's spec sheet lists one CR1616, with 24 months of battery life and accuracy within ±15 seconds a month; the module first shipped in May 1998.