Being the completist that I am, it was only a matter of time before adding the 1962-63 Parkhurst #NNO Tally Card and to my set, and the #NNO ZIP Bubble Gum N.H.L. Hockey Contest Entry Card:
Everything you read about these two cards refers to them as rare, but they seem to be quite common, even in pretty good shape. I just waited until I found them at a price I was willing to pay, given what they are. I believe you'd find far less of the 1984-85 OPC contest cards if you did a "tally" of what you can find on eBay.