In 1919, Briggs & Stratton acquired the patent and manufacturing rights for the Smith Motor Wheel. What they learned from that engine led to development of the ubiquitous Briggs & Stratton motors seen in lawnmowers and all kinds of small equipment, but before that the company used the motor wheel to power vehicles like this (restored) scooter, which won the AACA Grand National Award in 2005 and 2006, as well as the Senior AACA Grand National Award in 2007.
Unfortunately, it was then put in storage and hasn’t been run yet, though the seller says it starts and runs. He/she also notes that it should have the exhaust repainted black. Now, the bad news – the BIN is $25k. If it still tickles your fancy, find it for sale in East Berlin, Pennsylvania for $25,000