Indianapolis 500 winner Jimmy Murphy in sidecar with mechanic Ernie Olson seated on Harley-Davidson …

New York State Trooper on Indian motorcycle. The motto on his badge, Excelsior, 1920.

Motorcycle racer Fred Fretwell on his 1922 Harley-Davidson motorcycle. Fred "Freddie" Fretwell and t…

U.S. Mailman with his Flying Merkel Motorcycle, the first two-cylinder engine in 1910.

Australian Military police riding Indian motorcycles furnished under lend-lease deal, 1943.

Velocipede racing police motorcycle, August 23, 1921.

Velocipede rider getting a ticket from motorcycle police, 1921.

Velocipede driver riding with motorcycle police, Washington D.C., 1921.

Velocipede rider getting a speeding ticket from motorcycle police, Washington DC, 1921.

Motorcycle Police driving Harley Davidson motorcycles in front of White House, Washington DC, 1922. …

Motorcycle police officers inspecting motorcycle, 1923.

Colored Military Police Riding Harley Davidson 1944. African Americans served their country during W…

Della Crewe on Harley-Davidson two-speed twin with her dog in sidecar. On July 24, 1914 Della Crewe…

Motorcycle Police officers on Harley-Davidson bikes in front of police station, Honolulu, Hawaii, 19…

Montreal Police officers on Harley Davidson Motorcycles with sidecar rigs, 1937 Canada.

British Motorcycle ambulance heading to hospital, Cambridge, England 1917.

Volunteer Miss Norman driving Red Cross ambulance motorcycle, World War I, 1918.

Mr. Weishaar on his 1917 Norton Motorcycle, world record holder 100 mile race, October 22, 1914.

Indian Motorcycle Racing Team, Relay to Fisco 1910.

Australian military police riding 1943 Indian motorcycles, stage a demonstration for distinguished v…