It is an old watch for woman. My wife received it as a gift from her cousin about twenty years ago.
I found it from the old stuff in Shanghai. It does not work because of battery.
When I home, I open it by the special tool, which I will mentioned later. Took the battery out and located the size or model number is 364.
Now it is simple, go to Ebay.ca and bought a pack of this battery.
It is 5 PC pack. Brand name is Maxell, Silver Oxide Battery for Watch. 1.55V. Model number is 364 SR621SW SR60 363.
I made the order on Aug. 13, 2015. Received the item Today, Aug. 21, 2015. The back of the pack shows the exp. date 12.2016.
About the SR621SW Battery
SR621SW is the name of a small 1.55 volt battery. It is a popular battery for watches and other small electronics.S stands for its silver-oxide positive electrode terminal.
R stands for its round shape.
6 stands for 6.8 mm diameter.
21 stands for 2.1 mm height.
S stands for its sodium hydroxide electrolyte.
W means the battery meets the International Electrotechnical Commission (IEC) standard for watch batteries.
Capacity: 20 mAh