Meet the original Porsche 911 Turbo concept from the 1973 Frankfurt auto show

It was at the 1973 Frankfurt auto show where Porsche first made it publicly known that it was working on a new high-powered 911 to be equipped with a turbocharged flat-6, a car that would eventually become the 930-generation 911 Turbo. The announcement was made with the reveal of a concept, shown here following a restoration by its current owner…