i've seen alot (relatively speaking, of course) of "nos" heuer parts from a few different sellers. crowns, pushers, cystals, parts and pieces, etc, etc. i can't decide if these are the real deal or not? anybody know how to tell with any degree of accuracy? now i'm not saying these parts are fake, because i don't know. anybody have any insight or educated opinions on these? thanks in advance!

j.h.