Hello There are watches that we like to have in several examples, for some it is the Datejust, for others the Omega Constellation and Dynamic of the time, for me it is the Certina DS2. Its design based on the DS shockproof system and its excellent caliber 25-651 made it a best seller that was successful from 1968 to 1975 https://www.vintagecertinas.ch/en/certina-ds-2-2/ It is a robust and reliable watch that I particularly like and so I bought another one with a silver dial in excellent condition. Kind regards Georges