Designed by Hanns Trippel, who was fascinated with microcars and designed many of them, most of which were quick commercial failures.
I have two Amphicar brochures and one appears to be a prototype and the later one the production version. I have scanned the relative pages so comparisons can be made. They must have sold a lot of these in America, the target market, because so many are still around, and still floating.
Other sources claim this prototype is from 1961 and also refer to the prototype as the Trippel IWK - Amphicar Prototype. Little is known about this prototype. Comment below if more is known.
Source: Flickr (John Lloyd) https://www.flickr.com/photos/hugo90/6853126876/in/photostream/
Images: www.amphibiousvehicle.net
