At Authentic United we have over 15 years experience in passionately collecting genuine autographed football memorabilia. The majority of our collection includes an official Certificate of Authenticity from the football club; usually with unique, matching holograms on the certificate and shirt. When collecting signed memorabilia we try to obtain as much information as possible about the origin and include proof of authenticity where possible; including letters from the club or certificates from the company who original obtained the autograph. Please feel free to send a message if you have any questions about the item. Details of the item are below. Manchester City 22/23 Treble Winning Squad Shirt Signed Inc. Also included with this item is an official Certificate of Authenticity featuring a uniquely numbered hologram sticker; which exactly matches the sticker on the shirt.