Manufactured by Hainsberger Metallwerke KG (HMW) of Hainsberg, Dresden.
A bicycle manufacturer dating back to 1902, lightweight motorcycles were produced before and during the second war under the National brand. Post-war, the factory was run by AG Awtowelo under Soviet control, and 100cc Sachs-engined motorcycles of the same general appearance and construction were marketed as HMW.
They were not related to the Austrian marque of the same name, nor to the German HMW of the 1920s. See HMW under Disambiguation
Sources: GTU Oldtimerservice, Tragatsch
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