379 / SR521SW Energizer Silver Oxide Button Battery (On a Card)
Sony Original SR521SW, 379 Silver Oxides Batteries 1.55V Button Coin Cell MADE IN JAPAN - Also Replacement Same Model, D379, SR63, V379, AG0, SG0, 379, LR63, LR521, SR521.
SR521SW Watch Battery Replacement, Cross Reference and Equivalent to 379