Yes just like horizontals they made verticals with camshaft PTOs. I only seen a couple verticals myself. On horizontals the secondary PTO was primarily used for reverse operations on garden roto tillers and on verticals primary for self propelled mowers. I glad that idea didn't last long as it was hard on the camshaft gear train. Most OEMs have gone to a gearbox driven off the crankshaft.
The last time I needed a camshaft for one it was NLA so the customer just opted for a new self propelled mower. Walk behind mowers here as a dying breed as most operators in rural areas are buying riders and using sting trimmers. I still see for sale in urban areas though as those owners have tiny patches of lawn.
Rollo hopefully you got the engine's shroud as it will have the needed engine model and type numbers for parts look up.
