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1917 Humber 31/2 h.p. flat twin

500cc

Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin Humber 3 1/2 hp Flat Twin