The most striking features of this engine are the complexity of the carburetor, and the use of only one threaded stud to mount both the intake and exhaust manifold. The crankcase is filled with motor oil for internal splash lubrication; however, the unusual overhead rocker and valve assembly must be manually lubricated before operation. It burns gasoline on spark ignition and the large Bosch spark plug indicates it may have been built in the early 1920s or 30s. The engine, which came from the UK, measures 5”-long, 12”-wide, and 9”-high. The builder is unknown.