The 2017 Topps Throwback Thursday #TBT - 1967 Fence Busters Mark McGwire #89 /2245 trading card is a highly collectible item featuring the former Major League Baseball player Mark McGwire. This limited edition card is part of the Throwback Thursday series, paying homage to the classic designs of the past with a modern twist. The card is from the Fence Busters insert set, highlighting McGwire's power at the plate. As a near mint or better ungraded card with only 2245 copies produced, this item is a valuable addition to any baseball trading card collection.