What Are The Vintage Movements To Stay Away From?

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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?
 
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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.
 
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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.
Easy answer here, don't set 'em 😁
 
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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.

I guess my Globemaster is safe since it has a 501. 😁
 
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I guess my Globemaster is safe since it has a 501. 😁

As long as you keep up on the maintenance!