A Brief History of the Marque
Manufactured by amo-motoren-Gesellschaft mbH, Berlin-Schöneberg, 1950-1954.
These were bicycle attachment engines. (Hilfsmotoren or Fahrradmotor).
Distributed in Sweden by Aktiebolaget FACO Valhallavägen 75 Stockholm as the "amo cykelmotor"
These engines were used by a number of other powered bicycle builders including Brage of Hedemora, Meyfa Teddy of Berlin-Reinickendorf and Mustad of Denmark, Norway and Sweden.
Under the TX brand an ancestor of the company 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. See TX
The company built also 50cc two-stroke mopeds which in 1951 were named the "Amoped". They may also have been available under the name Amorette.
There was an AMO company in Munich in the 1920s.
Sources: Henshaw, GTU, mo-ped.se, motor-lit-berlin.de.