SR621SW Watch Batteries 2 x Seizaiken 364 Equivalent Cell Button 1920's Eberhard Hermetic 15J, Sterling Silver, Trench Watch Totally Renata 399 SR927W Batteries 1.55V Silver Oxide 399 Watch Battery (50 Early 1900's 14 Karat Yellow Gold "Hermetic" Trench Watch" at 1stDibs. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit 699 Operating Temperature Range: 40 Degrees Celsius to +85 Degrees Celsius Shelf Life: 5 years Leakage Resistance: Anti Leak Design Movement Compatibility: Quartz Japanese Movement Water Resistance Compatibility: Suitable for 50m Water Resistant Watches Mercury Free: Environmentally Friendly (0% Hg) High Low Temperature Tolerance: Extended Performance in Extreme Climates SKU: 699_K0066640