Photographers text reads,
"Dreirad mit 1-Zylinder 4-Takt-Motor, 211 qcm, 1,5 PS, 30 km/h, Bauzeit von 1897 bis 1904, erstaunlicher Weise über 14000 mal gebaut"
"Tricycle with single-cylinder 4-stroke engine, 211 ccm, 1.5 HP, 30 km / h, constructed from 1897 to 1904, surprisingly built over 14000 times."
Possibly the Mathieu of Automoteurs - see Belgian Marques (M)
The motorcycle section of this museum is vast - 3,500 square meters over three floors. The bulk of the collection features German marques from the 1870s to the 1980s, along with many machines from other nations.
More information: PS.Speicher Museum, Einbeck