This list I checked indicates that Omega produced approx. 1 million movements between 1939 and 1944. How active was Omega during WWII? They produced about 1 million watches from 1944 to 1947, according to this list. This is just a guess, but the subject watch might have been made circa 1941-42. I very much doubt the watch had an actual name. The number in the case back appears to me to be a case serial number, not a model number. The movement appears to me to be a calibre 300. This movement was used in a wide range of case styles, including square and rectangular styles, as well as round.