WOW ! Great story . It looks like a Lemania 13CH2P . Which has two pushers and a 30 minute register . The 33.3 is a one pusher chrono . I don't see a reference for an Omega version but it dosen't mean it exsist. Everything is there , it just needs some TLC . That surface rust is easy to remove . I wouldn't wind it or run the chronograph until it's been serviced .
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