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Todd Schultzyou can't reprint what was never printed in the first place. Similarly, it's not a counterfeit because there is no genuine. It's a fantasy piece.
EDITED TO ADD: I didn't mean to come across as flippant. I know there were a couple of players for whom Bowman made '56 prototypes, but they were commons--Koshorek and Shuba. I have never heard of a Mantle prototype--does yours resemble one of the styles contemplated by Bowman? I hope you didn't get burned too bad on the price. This is probably one of those "if it sounds too good to be true" scenarios.