I have a handful of these cards from a recent bulk buy:
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**Each card has the same back:
Does anyone know what set or year these belong to?
There’s a MGA 10 copy of the Charizard / Gengar card on eBay right now which is labelled as “1995 Pokemon Charizard Japanese Topsun” but I really don’t believe these to be from 1995, however Topsun is a likely fit as they look like more primitive versions of the Topsun gum cards from 2000 onwards.