Omega made a bunch of these 2-hand mens dress watches- this one has a very fancy case. Whereas watches like the Constellation and Seamaster were considered “sport” watches of their time- this was a true dress watch meant for formal attire. They usually range from 28mm-33, are very slim (meant for under a double cuff) and always 2 hands.
They are small and delicate for men’s fashion today, I bought one in 29mm for my lady and she loves it- perfect size for her.