Rare 1989 Topps Heads Up! Unopened Test Pack; with only (24) boxes ever produced with (24) single Pin-Ups in each box, these rarely seen die-cut player heads are a very sought after item by hobbyists everywhere; each pin-up comes with a suction cup and were made to stick to walls, mirrors, lockers or other surfaces; pack is completely sealed and the back features a player checklist; checklist features small head shots of each pin-up and includes (12) players not found on the back of the later 1990 issue including Schmidt, Murphy, Greenwell, Davis, Smith, Grace, Burks, Boggs, Jefferies, Viola, Strawberry & Jordan; small soil mark on back side under McGwire's name, otherwise pack is NM.