MARK GIORDANO SIGNED RBK CALGARY FLAMES AUTHENTIC GAME JERSEY PSA/DNA Auto COA STICKER. Has been certified by PSA and has a PSA sticker with serial number you can use to check it’s authenticity online at the PSA website. The paper PSA/DNA COA is not included but a replacement can be purchased for a small fee from PSA. Does come with a paper Certificate of Authenticity (COA) from Signature Auctions where I purchased this from years ago.