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Rob LThis is a tricky one. Mantle is an easy signature to forge and is also one of the top forged signatures. Your best bet is to purchase a Mantle that has been authenticated. Personally, I would not trust a PSA/DNA LOA that is dated after September 2004 nor would I trust a PSA/DNA auction type LOA. Right now, I only trust a Richard Simon or Mike Gutierrez LOA.
Just my two cents.
Rob L