RAYOVAC 397 ( SR726sw )

Recognised as one of the largest and most trusted of battery manufacturers,

Rayovac watch batteries are chosen by watch professionals the world over

This battery is a direct replacement for the following battery numbers....
Citizen 28, SR726, SR59, SR726W AG2(alkaline cell)

The physical dimensions of this battery are
Diameter 7.9 mm x Thickness 2.6 mm