Hiya Patrick,
You are liable to get all sorts of ideas and comments concerning "correct" radios for a particular VW vehicle year. As Jan has already mentioned almost all cars bound for the USA came with no radio at all. Dealers picked up a few bucks by doing the installation at the point of sale. What you actually had installed depended on the dealer's stock of radios. Usually Sapphires were offered and Blaupunkts were an "upgrade" item. But, if a dealer had not moved all of last year's stock of radios you might get one of those. The Sapphire models most commonly seen in 1970 were the XI (am only) and the XII (am-fm). For more info on actual manufacture by year, point your browser to
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Mike
1970 Bus - The Ruptured Duck