MARK VIENTOS NY METS SIGNED BLACK CUSTOM JERSEY SZ XL BECKETT. ALL OF OUR ITEMS COME WITH A CERTIFICATE OF AUTHENTICITY.. ALL OF OUR AUTOGRAPHS ARE OBTAINED IN PERSON BY MYSELF OR A REPRESENTATIVE OF: ALL STAR CARDS AND COLLECTIBLES. WE HAVE BEEN IN THE SPORTS MEMORABILIA BUSINESS IN SOUTH FLORIDA SINCE 1984.. SEND PAYMENTS TO: ALL STAR CARDS & COLLECTIBLES.. 4290 SOUTH UNIVERSITY DRIVE..