That sinking feeling

In 1961, the world's first mass-produced aquatic car came to market. The Amphicar, built in West Germany around a state-of-the-art Leyland Motors engine, could go 113 kilometers per hour on land and 7 knots on the water, and it cost a modest 11 200 marks (about US $20 000 today). Yet in seven years it sold a mere 4000 units.