Omega, Cal. 30, "30 mm Caliber" 1st gen., yellow roulette dial with roman indexes and birdie hand, ø 38 mm, circa 1939.
1st generation Omega 30mm caliber is a precious gem with great historical value. The two-tone yellow roulette design dial with Roman indexes and rare birdie hour hands, and the 38mm size cylinder case has an overwhelming presence.