A Divers style stainless steel watch from 1979, rotating bezel, automatic movement, bubble style date window, original bracelet I think, running very slightly fast but looks nice and clean. There is the number 12095 stamped inside the back cover but probably an unknown ?
Based on the serial number starting with "6-" and movement marked "Swiss"; I would say this is a model produced outside the US for the European or Asian market. We have precious few reference materials from the international market, so this may be a difficult watch to identify.
1979 Unknown (for now)
Not that it will probably make much difference to the eventual 'Unknown' ID but there seems to be a thread with the inside case back numbering as this model is stamped 12095, a similarly dialled in waffle black and open cased model is marked 12094 and another Seville style is marked 12093, (lots of chatter about this on Watchuseek back in the day).