I don't wholly agree with that sentiment, but I follow it as a rule of thumb too.
I have seen three individual Constellations - all yellow gold cap, all cal. 564, all sold in different locations in Denmark, none of them tarted up for sale, all with similar aging of dial/hands/case/movement - in the 26 mil serial range all three within 70 numbers of each other with onyx marker and black inlay in the hands...
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