Maxell Watch Battery SR726SW is a silver oxide low drain battery 1.55 V. Watch Battery 397 measures 7.9X2.6mm. It is mercury free and has a capacity of 32 mAh.
Interchange: Energizer 397, Renata 397, Varta V397, Rayovac 397, Duracell D396/397, Timex N, Citizen 280-28, Seiko SB-AL, I.E.C SR726 (SR59)