I need help recognizing my Grandfather Omega watch. I know that watch is from 1944, that it was given to my Grandfather in USA, when he arrived with 1st Yugoslav Partizan Ship in 2. World War. S.N. number is 10269463 and is 15 jewel. I was searching across the web, but I didn't find the exactly same model as mine. Please, be so kind and help me with some additional data.