In Reply to: Re: Early 9Ns w/Donaldson Air Cleaner-Decals posted by chris on October 24, 2014 at 00:14:46:
The very early 9Ns used a 6-loop type rim, before hat rims, but they are not the same as the ones today. The loops are cast iron. Very rare and sought after by us early 9N collectors. There are several parts that got changed in the infant years that never got documented.