Quick date setting, hacking second, and water resistance to 100 meters instead of 50 meters for the 1675. Another thing to not forget is the glossy dial for the 16750 second generation, with circled indices. [nt]
16 750, 16 760, these are two GMT MASTER references which are worth a consideration. Produced for a few years, just between the reigns of the 1675 and the 16 700 / 16 710, the 16750 showed to faces, vintage and modern, and painted matte dial versus circle...
Still have it, still wear it regularly. It's the earlier Matte dial. I've been thinking, for about 10 years of getting a new insert. Of course over those 10 years the prices of inserts have gone bananas! ...