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It is fairly light and obscured by the dark and light of the image of MvR so it is hard to compare it to known originals. Also, there are so many fakes out there and there is no shortage of MvR Sanke cards on which to perpetrate a forgery that without some iron clad provenance one should always assume such a card has a fake signature until proven authentic. 'It came in an old album' is not provenance. For something like this you would need to submit this actual card to a forensic handwriting expert who has hands on access to known original signatures.
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