I don't think it's intrinsically more difficult, just new styles for you to learn. Each one of those brands has its own subtleties, but most re-dials are not really very good once you tune your eye to it. Seiko collectors are extraordinarily good at using fine details to identify aftermarket parts. For most of these old Swiss watches, one doesn't find so many AM parts (with a few exceptions, e.g. vintage SM300/SM120), but the same observational skills will help you identify re-dials and incorrect parts.
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