Duke Snider has personally hand signed this 16x20 inch Photo with a Blue Sharpie Pen. AUTHENTICITY = This hand signed photo comes with a JSA Numbered and Tamper Proof authenticity sticker on the Autographed item and a JSA Certificate of Authenticity (COA) with matching serial number (a $25 value). JSA (James Spence Authentication) is one of the top third-party authenticators (TPA) in the memorabilia industry, so buy with confidence, and get The REAL DEAL!