In 1886 Siegfried Bettmann founded Triumph Bicycle factory in Coventry, England. They would go on to make more than a few motorcycles, part of the fabric of motorcycle history. In 1896 Herr Bettmann founded another bicycle factory in his native Nuerenberg, Germany and it was also Triumph Bicycle. By 1902 Triumph (England) started making motorcycles and Triumph (Germany) started in 1903. The two factories colluded through the early years and produced identical motorcycles but name confusion caused Triumph Germany to be renamed TWN (Triumph Werke Nurnberg). A 1956 merger ended TWN.
The 1951 TWN BDG 250 was powered by a 248 CC Split Case single twin cylinder air cooled motor. A split case single used two pistons and jugs with a single forked rod and a single head and firing chamber. It produced 12 HP and had a reported top speed of 68 MPH.
This 1951 TWN BDG 250 (VIN # 288407) lives in Englewood, Colorado and is listed as a 25,475 mile ‘beautifully restored’ bike. Seller states it has two small scratches that have been repaired and comes with owner’s manual, parts manual, service manual and an original sales brochure. The bike is currently bid at $3,250 with reserve not met
Sources:
Wikipedia
Bernies Bike Shed
Meisterdinger
Cybermotorcycle