A Brief History of the Marque
Paul Mühlbach, Kamenz (Saxony)
The German ¹ Adria firm's main business was building engines for automobiles and boats. Their motorcycles utilised sidevalve singles of 276cc and 346cc. Another source says the engines were 276cc & 282cc. Early models were single-speed belt drive, later models had three speed gearboxes.
Some engines were supplied by Lutz. (SF)
Source: Henshaw, SF