Flown Thermal Protection System (TPS) tile segment flown aboard the shuttle Discovery’s STS-51D mission, approximately .5 x .5. Encased in a cylindrical 2.75 x 3.25 piece of Lucite cut at an angle for display purposes, with a mission emblem and certificate of authenticity at the bottom. This limited edition piece was originally distributed through the Astronaut Scholarship Foundation. In fine condition. Accompanied by a matching certificate of authenticity signed by astronaut Don Williams certifying that it is a piece from his personal collection.
