Custom on-field style jersey. Everything sewn on, size XL. Hand-signed by Vladimir Guerrero Jr.The autograph(s) includes an official James Spence Authentication (JSA) "Signature Debut" hologram, "Signature Debut" is the autographed memorabilia equivalent to a rookie card. The JSA definition of a "Signature Debut" is as follows: "Any item that is autographed and received by JSA prior to the last game of the signer's official rookie season.Authentication: JSA Signature Debut Hologram