Casio BG-130 / BG-140 Manual — Modules 1913 / 1914

Two owner's manual PDFs for the Casio module 1913, each a different scan (English included). Casio fitted it in the BG-130 and BG-140. The same documents also cover module 1914. For module 1913, Casio's spec sheet lists one CR1616, with 18 months of battery life and accuracy within ±15 seconds a month; the module first shipped in Aug 1998.