A customer brought this bike in for engine work. These are very interesting mini bikes. The large fuel tank, makes it look bigger than it really is. Bennelli  made these motorcycles for MW. Bennelli marketed the bike themselves also, and called it the 50cc Racer model. When I was a teen, you could order this bike right out of the Montgomery Ward catalog. It would be shipped to you in a crate, partially disassembled. They included all the tools you would need to fully assemble the bike, along with detailed instructions, and an owners manual.