Manufactured by Nordap Motorbau GmbH, Ladeburg am Neckar, 1950-1953.
This was a 32cc bicycle auxiliary motor installed in the front wheel hub, initially with the fuel tank attached to the handlebars, and on most production models rather like a saddle tank astride the front guard. In Belgium, the Netherlands and Sweden it was sold as the Velmo, the only difference being the name on the engine cover.
Cyclememory.org lists Velmo-Motoren GMbH Hamburg with an image and description which matches that of the Nordap, as does mo-ped.se (which spells it Nordaap).
Sources: GTU Oldtimerservice, Cyclememory.org, mo-ped.se
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