You can use this tool to find the manufacture date of any vintage Omega watch from 1895 to 2008 using the serial number. The serial number on your Omega watch will usually be found either laser etched in tiny digits on the back or for older watches it may be inside the case.
It will be a number (no letters) between 5 and 9 digits long. The number containing dots, spaces and possibly letters is not the serial number, that is the model or case reference number which can be decoded using the Omega watch model decoder.
This tool does not validate if a watch is genuine or not, it purely translates the serial number to find the year of manufacture. If the watch type was not being manufactured during the year suggested by the serial number it suggests a fake or perhaps incorrect case/caseback.