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Chelsea F.C. Mason Mount Autographed Blue Nike Jersey Size M in Black Beckett BAS Stock #196480 04-25-CRD Certificate of Authenticity from JamesThis is a Blue Nike Chelsea F. C. Jersey that has been hand signed by Mason Mount. This jersey is Size M in Black. This item has been certified authentic by Beckett Authentication (BAS) and comes with their tamper proof sticker and matching certificate of authenticity.