I'd compare the serial to the age and subreference of the watch, make sure that matches. Then check some of the other features like the coupling yoke, which is symmetrical for early pre-pros and asymmetrical for later movements. Then as a non-watchmaker I just look for missing screws, missing or damaged components, obvious abuse like screwdriver gouges or wrecked screwheads and rust. I can't evaluate its condition the way a watchmaker could but if I can see several parts missing or damaged or rust over the steel components I can get a basic idea of whether its a nice clean movement or a junker.
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