https://www.chrono24.com/omega/omega-speedmaster-professional--id45885537.htm?searchHash=c4bd5847_A58MCm&pos=2
This one is a decent example, though I suspect the bezel was replaced at some point. Fairly even patina on the indices and hands, dial looks accurate with "T Swiss Made T" at the six o'clock, which is accurate to that era (T for tritium). It's hard to be sure without seeing it in person.
