Supposedly a very good way to check for originality of the dials of pre 1950's dials is the following (according to a very trusted collector): look at the three "s" in "swiss" or "swiss made". if they are similar, it is more than likely that you are looking at a redial. if you see variations, it's good. and that is because the "s" is very difficult to print similarly, and in the 1930's/40's, printing just wasn't there, yet. Don't know if this is true, but it does sound reasonable to me.
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