In the mid-sixties, you could stop by Hertz Rent A Car, pick up one of these and take it racing over the weekend. At least, that is what the urban legend says... Here are three 1966 models that I saw last year at the Kirkland Concour d'Elegance. I read these use to go for $12/day. The contemporary version I rented a couple years ago was a bit more expensive than that but a lot of fun.
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Source: Photographed by the author in Kirkland, Washington.