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remove the back cover of the watch the battery is located there purchase the correct size battery insert replace back cover (if you do not have a jeweler's tool for removing the back cover have found that the blade of a pocket knife can be used to pry it loose just need to be careful not to scratch the finish
Pocket-Watches utilize a wide variety of batteries and the best way to determine which battery is the proper replacement you'll need to either , 1) contact the manufacturer , 2) take the watch to a jeweler to have the watch disassemble to the point where the type of battery can be determined , 3) try RadioShack or Walmart to see if they could be of assistance .
No, there are at least 14 different sizes in which pocket watch keys have been made. The size used with a particular pocket watch depended on the size of the watch as well as the proclivities of the particular watch manufacturer. Jewelers and watchmakers typically have "bench keys" in their shop which can be used with various size and brand key wind/key set pocket watches.
In battery power it is 2.5 better that Toshiba. In size it is larger that Toshiba but not a lot.
what is the battery size for a wenger swiss military watch 79149
American pocket watches classified as size 8 are 36.4 mm in diameter.
You cannot always identify a pocket watch size by it's serial number but you can by measuring it. See this web site for inches to size designation.
Depending on the type of pocket radio that you are using, usually triple A or double A batteries will work. There are also a few pocket radios that require the same battery that is used for the phone, a lithium ion battery.
my ASPEN watch actually has two batteries. There is a metal plate with a CR2016 battery beneath it but there is a 2nd battery compartment and I do not know which battery it requires.
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Energizer 377