1937 Harley-Davidson EL Knucklehead, Engine no. 37EL1094 in United Kingdom
Dale's Wheels Through Time - The 1937 Harley-Davidson Knucklehead - This Model EL features an all-1937 61c.i. Knucklehead engine along with the one-year-only Delphine Blue, striped in Teak Red and edged in