Zündapp EM250 from 1926. The model was built in years 1925-1927. Two-stroke, single-cylinder engine 249cc. Power output: 4,5 HP at 3100 rpm. Weight: 85 kg, top speed: 80 km/h. Three gears, Webb fork. In 1928 EM250 was replaced by a very similar, but bigger model, EM 300 (298cc, 8 HP).
Three-wheel version. Photo from 1926.