Get more popcorn, Drew - and perhaps a Wednesday "hump night" *****tail to wash it down. The challenge continues!
Personally, I think Mr. Gervais, the Ass't. Branch Manager, is utilizing his own area slang when referring to the Model 55 Hillside Tractor in his typed-up local area price list. I need to see it in an official Massey-Harris Publication, advertising literature, operators manual, parts list, or something like that before I believe Massey-Harris officially had a model they called the "55 Hillside". :-)
Keep the research going. Who knows what we might find!!
Cheers,
JB