Just a note to say I've been able to get in to the original old State card index system in addition to the microfilmed records I've already put up and found--- nothing.
The motorcycle section of the records had nothing ABC at all. Obviously I then hunted through the general car/truck/tractor/etc, section to see if they'd been misfiled but no joy. Nevertheless ABC seemed to be a popular brand name for all sorts of oddball mobile machinery. Roadrollers, warehouse trucks and the like as well as mysterious types of mobile agricultural machinery but no evidence of anything motorcycle.
I'll keep looking.
