Bob's Grandson Graham driving his Moto Mower at the 2008 Show.
Moto-Mower (with grandson)
Bob's Grandson Graham driving the Moto-Mower Bob purchased for him. We don't know for sure who built the tractor, although we know that Sears was one of the dealers. The motor is a 1958, so we assume that's the year of the tractor.
Bob restored the tractor and modified it by removing the cutting deck and added a temporary brake (the blue lever) which has since been removed (not pictured) and the original brake has been repaired.
Here's a picture of Graham driving the Moto-Mower in the parade at the 2010 Show (the first time he drove in the parade).