Omega Seamaster gold vintage date and value?

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I’m new here. Have inherited 2 old Omegas. Likely from 50’s. Interested to understand the year and value of one of them. Good working order. Excellent movement. The strap is obviously not original. Seamaster Caelndar Auto. Seems to be gold with a mark behind a lug? Would love some advice before heading to Omega. Photos attached. Thanks. Sam