My 21,000 mile original one owner 911T with A/C had this folded up in the owners manual. Was this something seen in Porsche showrooms in 1973? I would have been 9 so I can't recall that well (however I do recall Plymouth Superbirds on dealer car lots then).
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Dated 1972. The Volkswagen nomenclature is what is throwing me however I am sure they shared showroom space then.