Built by Charley Merz (a famous race car driver ... on American Pickers. In 2017 (season 17, episode 6, "Something Weird Here"), Wolfe and Fritz went to check on the 1919 Franklin Series ...

The rocket car wasn't the only working vehicle Baron Margo had on his property. While he might very well have a vehicle he bought from a dealership, none are present in American Pickers ...