Another test issue of 1973, the 24 Topps Pin-Ups include the same basic format and the same checklist of star-caliber players as the Comics test issue of the same year. The 3-7/16" x 4-5/8" Pin-Ups are actually the inside of a wrapper for a piece of bubblegum. The color player photo features a decorative lozenge inserted at the bottom with the player's name, team and position. There is also a facsimile autograph. Curiously, neither the Pin-Ups nor the Comics of 1973 bear team logos on the players' caps. - 2006 Standard Catalog of Baseball Cards, 15th Edition.