Casio BG-340 / BG-341 Manual — Module 1559

Two owner's manual PDFs for the Casio module 1559, each a different scan (English included). Casio fitted it in the BG-340 and BG-341. Casio's spec sheet lists one CR1616, with 15 months of battery life and accuracy within ±15 seconds a month; the module first shipped in Nov 1996.