Hello and welcome,
It´s a Swiss made, gold filled Omega automatic from the late 60´s early 70´s. Maybe with a cal 552 or something like that. The condition of the case looks actually pretty good, a lot of these entry level gold filled watches don´t stand the test of time very well and end up with very worn and rounded edges, yours looks nice and sharp and has retained its bevels.
Not a collectors piece, but the case condition gives it a little head start on the value front. I think about €250 - €350, with the Speidel band adding nothing at all.
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