I understand that alot of factors (cosmetic conditions, originality of dial etc) affect a vintage watch pricing. But it is enough to just verify it's movements of particular type of make to judge the watch authencity? Meaning as long as the movements physically is the same as a reference piece, that is a authentic watch.
For example, is there an imitation for particular movements? Are there reproduction of end-of-life movements? (which i doubt so as it is too costly)