That's a Clark aircraft tow tractor. We used to have one like that where I work... I had the priviledge of rebuilding it after it sat through the flood of '93. I wish I could remember the model #... but it has a 6 cyl Continental flathead engine (at least ours did), with a 3 speed manual transmission. Ours did duty aboard an aircraft carrier during WW II, from what we were able to find out about it from Clark by running the serial #'s. It will do pretty good wheelies, as several unfortunates found out that no longer work for us