Matt's list of bikes includes a Harley-Davidson "39WLDD." I wonder if Matt or anyone else can tell us if there are authentic factory cases with the second "D" stamped in the motor number? Not just "WLD" but "WLDD."
I ask because in my study of models and motor numbers I have found no original H-D documentation that lists a "WLDD" stamped motor number. The only places I have seen "WLDD" motors mentioned are in secondary sources like books which are not entirely accurate. So far I have not seen "WLDD" mentioned in original Harley documentation such as factory model lists, etc.
If authentic "WLDD" stamped motor cases do exist I would gladly like to know so that my study can be complete and accurate.