Hummel is a division of DKW, the well known German motorcycle works. DKW had begun producing motorized cycles in 1919 and in 1932 became a partner in Auto Union. The introduction of the Hummel 155 in 1965 caused a considerable stir in the European motorcycle press. The Hummel was never exported to the US.
The 1965 Hummel 155 used a 50CC two stroke air cooled motor that made 4.2 HP. Hydraulic suspension, drum brakes and a three speed transmission gave the 155 a cruising speed of 45 MPH. The bodywork included the combined headlight/fuel tank and the bike could be ordered with a foot or hand shifter. There is a fine article and a large number of photos of how the 155 Hummel should look here on BikeGlam You can see that there are more than a few parts missing.
This 1965 Hummel 155 is in Riverside, California and is listed as a 2062 mile restoration project. The current price stands at $900 with reserve not met in an auction that ends Tuesday, October 18th