A Brief History of the Marque
Aktiengesellschaft für Motorenbau, München
AMO built a 146cc twostroke from 1921 to 1924. They were belt-driven with rim brakes and a very short exhaust which ended in front of the crankcase.
Another company by the same name built mopeds in Germany using their own 48cc two-strokes in 1953-55. They were also known, it is believed, as Amorette.
Sources: Henshaw, GTU