Note: "This was my father's watch, that he purchased new in 1960 during a trip to Switzerland. It is all original and was on my wrist continuously (except for time-outs for cleaning every five years) from my 13th to my 50th birthday. Played baseball (worn on my pitching arm), swimming, skiing, etc. I think it's a 6604, but I can't read the first two numbers on its lugs. If you look carefully you can make out the crazing on the black enamel dial." - SS