Hello and thanks for all information given for free... As a newbie I tried to post already my new Seamaster, but was not successful. Second try. AS I learned, the 600 hast been built in USA, but it is written "Swiss Made"??? I dont know much about Omega Watches, but my father told me, if there comes along a "Seamaster", take it. It came and is mine now... Thanks for help.
Looks a nice watch, 18k case, great dial and lovely looking movement. I'm not sure what your question is exactly but, some of these were locally cased and that included some being cased in USA but this one appears to be Swiss cased to me. Someone who knows the hallmark can say for sure. Looking up quickly, 352 shown in the hammer head should be Serva SA based in La Chaux-de-Fonds. Taken from this page. Enjoy it, Chris