Water scooters—as they were originally termed—were first developed in the United Kingdom and Europe in the mid-1950s, with models such as the British 200cc propellor-driven Vincent "Amanda", and the German "Wave Roller". Two thousand Vincent Amandas were exported to Australia, Asia, Europe and the United States. In the 1960s, the idea was developed further by Clayton Jacobson II of Lake Havasu City, Arizona, USA. Originally a motocross enthusiast, Jacobson's idea was designed in the mid-1960s, powered by an internal pump-jet rather than an outboard motor, made of all aluminum, and had a fixed, upright handle. Jacobson eventually quit his job in banking to devote himself to developing the idea, and had a working prototype by 1965. It differed slightly from modern personal watercraft but had definite similarities. He completed a second prototype a year later made of fiberglass.