1939 Harley-Davidson EL Base | Hagerty Valuation Tools
Harley Davidson Knuckle Speedball 36-1939 decals
1939 Harley-Davidson Model UL specifications and pictures
Motorbike Harley-Davidson Model U 1939 for sale - PreWarCar
Barn Find: 1939 Harley-Davidson Knucklehead | Barn Finds
Dale's Wheels Through Time - Pre-war Knuck - By 1939, Harley-Davidson was in its fourth year of producing the powerful 61c.i. OHV Model EL - the "Knucklehead". Dale built this machine from