Omega Seamaster movement with a 50s Constellation case. Just serviced. Automatic works well as does self wind and it keeps excellent time. So it's not a Constellation but a 353 Seamaster movement probably from the 60s and put into a 50s Constellation case and the dial modified to read Constellation. This is not a collectors watch or heirloom but a very good serviceable watch with 17 jeweled Omega movement and case that keeps good time. It is water resistant and has a new seal but I try to keep it dry. Rare very superficial scratch on crystal edge seen only with magnification. Case has normal wear for a 50s. Wind is tight. Leather strap water and allergy resistant. Watch and band are 9" long. Serial numbers 2652-6SC case and 12579502 movement. Has the proper gold emblem on the back cover. I have pics of the movement and back cover as well as the watch to interested buyers. $250 OBO.