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I didn't think it was a forgery but what is the secret mark you mentioned?
I could tell you but then It wouldn't be a secret and I would have to kill you.

But, seriously ALL of the early Baden Stamps have a secret engravers mark. On these 2 it is hidden in the scallops in the lower right corner. In the sane area as the period. It is difficult to explain what to look for. It is sort of a curly(?) thing.