Isaiah Rider Autographed 1994 NBA Slam Dunk Champion 8x10 Photo PSA DNA COA 1994 NBA Slam Dunk champion Isaiah Rider has autographed this 8x10 photo from that event. Autograph is authenticated by PSA DNA. It is a "witness" COA meaning a representative from PSA DNA was present for the signing with Hall and witnessed him signing your item. Item comes with their unique hologram # and COA which is verified on their site.