Omega Watch Case Back. This information will give you some insights into which omega movements were in which cases. If you have an older omega it may have the serial number on the inside of the watch.
Very rare oem omega quartz digital mens 34mm swiss ss case caseback 196 0074. These numbers are typically found on the internal movement side of the case back. Crystal and gasket will need to be purchased separately.
Still the principle remains the same for both systems that the first three digits define the characteristics of a watch.
Vintage omega side second silver case pocket watch not working. The case back unishell case of an omega seamaster de ville with the reference number 136 020. It should also be noted that sometimes an additional number typically a 0 or zero between the third and fourth numbers. The cb at the bottom means that centrale boites made the case.