Ok, so quite often I read responses telling the advice seeker to stay away from a given watch and very often it's the movement that's mentioned as the main reason to pass on it -- I assume reliability or perhaps collectability may be the reasons. So, speaking strictly in terms of vintage Seamasters and Constellations, what are the movements to avoid?

 

There were some winding issues with the first 50x calibers (500 & 501). Something to do with the post and bridge the rotor is attached to.

The push - pull quick sets on the 56x need to be serviced properly or they'll break. Sometimes you get lucky and a "broken" one is only in need of cleaning and oiling.

 

As long as you keep up on the maintenance!