So, the one in the first photo should have a 6139B movement and a date around 1972 or later. Except for the chrono sweeper seconds hand, it all looks OEM to me except of course the bracelet.
In the second photo with a blue and a black, I'd say both are all original. Both should have 6139A movements.
The last photo I cannot tell what it is, original or aftermarket dial,I see absolutely nothing wrong with the entire watch but like you say is it 'too good' or 'really well preserved.'? Ask the right questions and go for it, the bracelet is original I think it is probably all original. The chrono sweeper might be aftermarket which would not be a deal breaker for me given how amazing all the rest of it is.
In the second photo with a blue and a black, I'd say both are all original. Both should have 6139A movements.
The last photo I cannot tell what it is, original or aftermarket dial,I see absolutely nothing wrong with the entire watch but like you say is it 'too good' or 'really well preserved.'? Ask the right questions and go for it, the bracelet is original I think it is probably all original. The chrono sweeper might be aftermarket which would not be a deal breaker for me given how amazing all the rest of it is.
