The name of antiquities, not only have high artistic value. The price was definitely "exorbitant". It seems Roper Steam Motorcycle production in 1894 which mentioned going to be the most expensive in the United States (U.S.), even in the world. Once the prediction of the American auction house Auctions in Las Vegas, USA.

Auctions predict this steam-powered motorcycle can penetrate the previous record held by the Cyclone Board Track Racer 1915 OHC production is sold at up to 520,000 U.S. dollars.
Roper Steam is very rare because only two units produced by Sylvester Roper of Roxbury, Massachusetts. In addition, also a historic high due to be one proof of auto industry development in the U.S. in the 19th century.
Under normal conditions, this bike is capable of "speeding" up to 40 mph or 64.3 kph achieved in May 1896. This motor uses the energy from coal to heat water and drive steam motor. In history, he can roam up to 7 mile or 11.2 miles.