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The Old Mill Museum

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The 1939 Knucklehead
The Old Mill Museum

The 39 Knucklehead

John H Glimmerveen Licensed to About.com

The 1939 989-cc Knucklehead Harley Davidson had many new features: hemispherical heads, the first roadster V-twin with OHVs, and a four-speed gearbox. This model clocked an incredible 136 mph on the sands of Daytona in Florida.

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