for your information; I’m very new to the vintage watch industry and I would like to purchase my first omega watch. Can someone please tell me more about the watch in the pictures below and what can you guys tell about the cosmic series in general? Also please tell me if this is the wrong place to post it. I’m also new to the forum.

The reference 166.026 is on the omega vintage database website and it states it is a 1968 watch. The seller however says it is 1970-1979. Can someone give some clearance on that?