I read an article once that purported to tell you how the differentiate the "older' or "original" rack packs from the later ones. It involved the materials,the wrapping and staples used, and the positioning of the Christmas decorations on the wrapping. But you would have needed both versions in hand or have been smarter than I am to tell the differences apart from ebay scans. The older material was supposed to confirm those packs were from the 60s and 70s. But I have never seen any concrete confirmation these thing were actually from or sold in those decades
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