3"x2" zinc alloy metal belt buckle features a cast replica of the 1936 Knucklehead Engine. In that year, Harley-Davidson introduces the EL, an overhead valve, 61 cubic inch powered bike. With increased horsepower and bold styling changes, the motorcycle quickly earns the nickname of "Knucklehead," due to the shape of its rocker boxes that resembles the knuckles on a hand.
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