Just wondered if the experts here can help me identify this 1940s Omega. There is no case reference in the back, just what appears to be a serial number. All these are the seller's pictures, not mine. The watch is 18k yellow gold, with a press-in back, and lugs like this - The caseback inner has the usual Swiss markings for 18k and a long number. No case reference number. The movement has exposed bumper springs and looks like a 28.10 (RA SC?) to me, s/n is 10705xxx. The case looks very like the one in this (later) 1951 advert. Any ideas?