Though it's not very widely known, the small appliance manufacturer Braun offered a few auto accessories in the 1960s. Their T 510/580 portable radios, introduced in 1962, were available with an under-dash slide-in mount that allowed you to use your radio in the car and also take it with you, like the Blaupunkt Derby and similar radios from other manufacturers. What Braun offered that the others didn't was the international-style aesthetic of industrial designer Dieter Rams. Rams has a cult following among design fans and his work for Braun in the '60s is thought to be the inspiration for much of Apple's award-winning product design of the last few years. He's currently the subject of a retrospective exhibition at the Design Museum in London. These radios come up for sale occasionally but the under-dash mounts would have to be among the rarest of the rare of auto accessories.
Braun also offered an automotive version of the famous Reinhold Weiss desk fan. The design was also licensed to VDO, so there are both Braun and VDO branded versions out there. One of these would be right at home in an early VW 1500.