From here :Was Coca-Cola really called Coke in 1936? It was "the real thing" by the 1940's, but was it "it" in Germany in 1936? Does not ring true...
From here :
Neither can I , it's disappeared.lolThanks. An extraordinary collection at http://www.nationalarchives.gov.uk/theartofwar/prop/home_front/
Still not at all sure, wherever it is from (I didn't find the "Ein Getrank" poster there, but have not opened every page (yet).
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I think it is a sort of Urban Myth.