Sponsored Links (Register now to hide all advertisements)
Don, The washer does not appear in the Earliest of 1940 Parts catalogs, however the 1934-38 catalogs list it (I do not have a 1933 or 1939) in the Canadian 1938 catalog it states the washer was used on Models: 40,48,50,51,67,68,77,78,79,81A,81C,81T
This certainly supports assumption they were used on iron heads from 1935-38.