Companies like Rolex and Omega (actually pretty much every major production watch company) were very consistent with QC when it came to typeface, dial finish and layout. There were periodic changes as models changed or different vendors were used for the parts, but these were always changes made en mass. There are fluke variations, but they are pretty well documented. There are the rare redials that are so good they can fool 90% of collectors- some weren’t done to deceive, there were just some very good artisans out there who did redialing for watchmakers professionally.
Look at tons of pictures, reputable sources and known originals and really scrutinize the details. You will see lots of similarities (serifs or non serif, case finishing, placement of indices and hash marks).
It’s like sorting coins. They all look alike with slight variations in patina or tone- but they were stamped out- they all look the same. When you quickly glance one that looks out of place, it catches your eye. The same will come with spotting watches.
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