A Brief History of the Marque
1933-1937 Berlin-Aachen Motor Werke AG, Berlin and Aachen
As it became increasingly difficult after the seizure of power by the National Socialists in Germany to sell foreign products, the Belgian motorcycle designs saw in Aachen forced to rename BAM. BAM with the fuel tank now Germanized two-stroke and 350cc and 500cc motorcycles FN could at least have offered up in Germany in 1937 as a German product.
Sources: GTU Oldtimerservice, Henshaw