This is the uncommon jumbo caliber 561 Omega Constellation model 14777, measuring 37mm in diameter with 19mm lugs. This watch preceded the jumbo 168.001, and like its successor was produced for the Japanese market mainly, and for a very short two-year run between 1961 and 1962. During this short production run, Omega removed the writing “Officially Certified” from the dial print, perhaps to simplify the dial appearance. This case with sharp beveled bezel has never been polished. The correct Omega decagonal crown is installed, which is becoming difficult to find. The Dauphine hands and finely aged dial are completely original. Any time I’ve found these watches, they’ve had aged dials. The clean caliber 561 automatic winding movement was just meticulously cleaned and is accurate.