Garelli Mosquito 38b 49cc
Garelli produced hundreds of thousands of Mosquito two-stroke cyclemotors, beginning in 1946 with the 38A. The 38B, as seen here, was introduced in 1953 and was enlarged from the earlier 38.5cc to 49cc.
Most Mosquitos were fitted to other manufacturer's chassis but this example is in a Garelli frame. PA.