The story of the Rolex Cosmograph could be called the most chaotic of all the Rolex Oyster models. Rolex is keen on creating a winning product, but it took a while in this case. The watch never really got off the ground until 1986 when the market for them exploded and the watches would often sell for double the retail price in Italy. The "Paul Newman" models manufactured around 1967 were and still are the most desirable of the Daytona models fetching prices over $30,000. It retailed for around $150 back then. In 1989, Rolex replaced the Valjoux workhorse movement with the Zenith El Premiro movement. During the 1990s, the Daytona was the only Rolex model not using a Rolex movement. In 2000 came the newly developed Rolex caliber 4130 with a 72 hour power reserve.