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Zan, it's a bad forgery.
Greenberg had a steady, compressed signature that looked the same up until his death.
You have an awesome Greenberg collection by the way.
Actually, to my knowledge, Greenberg's signature became more compressed as the years went on. That said, this card appears to show an earlier attempt at his signature.
I think the key for me is that it does not appear to be an "era signature" for when he could have signed that 1983 Donruss HOF card.