NSU Bullus 350SSR, 1935 The example presented here, frame number 898181, was first delivered new to Dambroich/Germany in October 1935 as a NSU Bullus 350SSR Rennmaschine according to Audi Tradition factory records. Over the years, the original frame got lost and an avid motorcycle enthusiast installed engine and transmission into a 1951/52 Tri..