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Hi Brett,

Educated guess says a TWN (Triumph Werke Nürnberg)? Wikipedia:-
After 1913 the English and German factories diverged, with the Nuremberg works making motorcycles with 248 cc and 269 cc two-stroke engines. After the Second World War Triumph made successful models including the 200 cc Cornet split single two-stroke and the split-single 1 cylinder 350 cc Boss. A split single has one "divided" cylinder (with 2 bores) but only one common combustion chamber and spark plug. Triumph/TWN's production of split singles began with the BD250 in 1939 designed by Otto Rieze.
Regards,
 
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