My buddy gave me a bunch of cards some time ago, and there were a few of these smaller cards from 77-78 OPC. According to the info I found, they were inserted one per pack. Featuring a facsimile autograph, a lot of the stars of the day were represented: Cheevers, Dryden, LaFleur, Potvin, Sittler, Perreault, Dionne, Clarke and others. While this 22 card set was included in both 77-78 Topps and OPC, evidently the previous year it was Topps only, with a Bobby Orr.
Great action shot for the Dionne, I hope he threw some big haymakers.