I am still missing four cards to complete the 1971 O-Pee-Chee Cubs set. This set has been the most difficult and expensive thus far.
The 1971 OPC set has the same number of cards as the Topps set, 752 cards. The high numbers from the Topps set are expensive. The high numbers from OPC are very expensive. The four I'm missing are all high numbers. Ernie Banks is going to be the one that will break the bank, no pun intended. I'm also going to have to pay way more than I normally would for Leo Durocher, Phil Regan, and JC Martin.
The OPC cards from 1971 are unique because for the first time since partnering up with Topps, OPC designed a completely different back. Or at least they did for the four series. Just the background color was changed for the fifth and sixth series.