For what it's worth, when I got into cards in the late 70's I hung out at the local card shop and since I was interested they taught me stuff sometimes.
One day they showed me a test wrapper, maybe 74 deckle? And told me if I ever saw cards wrapped with that sort of wrapper to just buy them all, or as many as I had the money for.
They also said that people and dealers doing that was making Topps do fewer test issues since they couldn't get a reliable test.
I never did see any, but did occasionally find the odd item like thirst break gum. One pack, in a store that was part of the woolworths chain. Nasty stuff.
Steve B
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