Pony Express Autographed SMU Mustangs 16x20 Photo Dickerson +2 JSA 12783 This is a 16x20 photo that was personally autographed by 3 members of the SMU Mustangs Pony Express including: Eric, Dickerson, Craig James and Lance McIllhenny. This photo includes a certificate of authenticityfrom James Spence Authentication (JSA) and Denver Autographs.