Thanks in advance for reading this and your help and advice. Please help me date this Omega Geneve (early 1960's I belive) It is stainless steel, manual wind 17 jewels with no date function and adjusted to 2 positions. The only marking on the caseback is "waterproof". The serial number is 28812117. It has the 601 caliber. I read somewhere that the early Geneve models were in between the Seamaster and Constellation in value and quality. Is this true?