DUESENBERG MOTORCYCLE 1902

Before earning legendary status in Indy car racing and creating the mighty Duesenberg Model J motorcar in 1928, Fred Duesenberg created a motorcycle in 1902 that featured a unique rotary valve. Only one was produced before his attention turned to the new automotive industry.

via: http://thenewcaferacersociety.blogspot.com/2009/01/its-duesy.html