Disclaimer: NOT a printing expert
Darren,
If it’s a printing plate it should be aluminum. I don’t have the exact year, probably mid-80’s, Mid-Atlantic Coin Exchange was selling ‘62 Baseball Green Tint plates. I believe they had Baseball, but also Football and Hockey printing plates. I know some of the sheets were cut to individual size cards, but I’ve also seen some sheets as well. Unsure how they got their hands on them, but they are out there.
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