The 1971 O-Pee-Chee issue is a large and difficult set to complete, the design and checklist mirroring the Topps issue of the same year, although 14 players have different photos or team affiliations than their Topps counterparts. The cards can easily be differentiated by their back designs, which are yellow. Presented here is a complete low number run, cards 1-523. Average FAIR condition, a collector-grade partial set that has been well-loved during its lifetime. 523 cards total.