It would've been made in Germany (obviously), but Omega was a company that bought guns from whichever company could give them the best deal at a given time (this was at a time when they could turn around and sell those guns in the US, pre-1968). There are a couple of major companies that MIGHT'VE made this revolver, but you'll have to take off the grips to see which one; "Rohm" (the same people that made the "RG" series) should be marked with a <R> on the inside of the grip frame, Herbert Schmidt should be named, Weihrauch may or may not be named, and a company named EM-GE Sportgerate should be marked with an "EM-GE" inside the grips.