361 SR721W
Replaces: 361 SR721W TIMEX X SB-BK 280-53 SR58
Cell Size: 7.9 x 2.1 mm [0.311 X 0.083 Inches] 1.55 Volts
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Silver Oxide cells will offer a more stable discharge pattern than alkaline, essential for longer life and performance, in precision instruments such as watches.