Well, I looked all over for anything I could find, but so little out there. Apparently they were made by a company called Sensation in the 70's, and were popular among landscapers for the indestructible deck. The article below was with that pic I posted earlier.
In the 70's when I was a kid, I mowed a few lawns for spending money, rather than ruin the family riding mower, my Dad would take me to the local Lawnmower Shop where we could rent one of these Bob Cat push mowers. These mowers were practically indestructible, with a cast aluminum deck, steel wheels with bearings and B&S commercial motors. Everything was bomb proof on these units, even the grass catcher was simple and had a rugged steel frame. Hide
If you look closely you can see that the wheels had no height adjustment lever and had to be set with with a wrench. That last bit always struck me as unnecessarily and conspicuously milspec rugged, but whatever, it was simple. These mowers were very popular with the pro landscaping set for a long time and then they disappeared. Near as I can tell, this type/model of mower was originally put out by the Sensation company, and enjoyed considerable popularity and loyalty for many years. I am not sure if it came to Bob Cat by merger or license, but I guess Sensation changed hands a few times and was ultimately swallowed up by Lawn Boy (Started by Evinrude Outboards), which then got eaten by Toro (which had previously gobbled up Wheel Horse Tractors - a Division of AMC, yes, that AMC). So somewhere in this cluster#%$ of mergers, somebody killed this model. I wish they hadn't the world could use a simple durable mower.
Can't find any mention anywhere about model numbers, if they even had them...