This Autographed Grey Majestic Authentic Collection Size 44 Jersey has been Personally Signed by Mike Piazza of the New York Mets. This item is 100% Authentic and comes with a PSA/DNA Certification Card and a matching numbered Hologram. This is a PSA in the Presence Authenticated item which means a PSA representative was present when this item was being signed. The authenticity can be verified on Professional Sports Authenticator website.