Beacause watches get cloned. One such example is a mil SM300 which appeared in a Japanese book and next thing dozens of fakes and Frankens appeared wearing the same markings. I was offered one. This can have a negative impact on the value of original since when people google the number they get info that it relates to fakes, or they get multiple hits which amounts to the same thing. You don’t want to be holding the original when a slew of good fakes appear wearing the same number.
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