Drew thanks for a good laugh to go with my morning coffee. It wasn't in any kind of Hands Off historical museum, I just may have leaned into the huge flywheel to determine if it was seized, but kind of figured after laying-hands and my back into it that it was likely to much reciprocating mass to even budge even if it were not seized.
The thought of a gent trying to hand-crank that motor could have made for a great silent film -- and they'd not have to stretch the cables far for lightning!
I fetched a self-propelled Honda Mower a neighbor had put out with the trash. I dragged it home picking up the rear drive wheels (I was riding a bicycle). When I got home I gave it a pull thinking it would have a broken rod/no compression, bent crankshaft and the damn thing started right up 1st pull. I've had it for about a year - EVERY TIME I've pulled the cord it's started first pull. Doesn't matter if it was run out of gas and filled back up - 1st Pull. Let it sit for a month+ 1st Pull = Start. NEVER seen a motor that cranks first pull every time.
The size/mass of that dinosaur, up-draft carb, primitive ignition. Boy it would be a bear. I'd be running a rope around the flywheel, removing a board and looking for a horse!