Four-cylinder motorcycles were a top-end luxury in the 1920s and 30s, and the Indian Four was built as such from 1927 until production ended in 1942.
1935 Brough Superior SS100
photos of vintage motorcycles | ... : 1953 BMW R25/2 - Classic German Motorcycles - Motorcycle Classics
Nothing I Love more than vintage motorcycle ads
1918 Excelsior Series 18 Motorcycle. Excelsior Motorcycles (1907-1931). Chicago, Illinois.
Classic racing #poster #vintage #motorcycles | caferacerpasion.com
1914 Cyclone Motorcycle - Extremely Rare Vintage Bike. Ride around on 6th floor ex Steve McQueen & Wright
Bike EXIF Classic Motorcycle blog
1956 matchless G80CS Classic Vintage motorcycle British motorbike
vintage motorcycle helmet cafe racer illustration - Google Search