The SX150 and SX200 visual basic difference apart from a few trim and badges, was the side panels. The 200 model had its own more arrowed version of single flash each side compared to the 150 model. The 200 models apart form the bigger and more powerful engine also had the disc brake and front dampers set up as per the earlier TV models. The main point to be wary of in buying an SX200 is that it is real, and not a faked version built from a Spanish built machine. Spanish built SX200's and later Serveta badged models do not command such high prices as the genuine item, so check carefully frame and engine numbers. On feature normally hard to disguise in faked models is that the Spanish built machines had flat squarer type engine mounting points on the main frame, where as the Italian models had circular tubes. I would highly recommend checking the frame number area as well for signs of tampering and weld marks, to be sure you purchase a correct model. Innocenti stamped numbers were always very precise and clean, following the curvature of the frame, Serveta models on the other hand were stamped in a more straight line and were not as clean and tidily done. Genuine models currently command high prices, and unless this is the model you really want, choosing or settling for a "lesser" model could often save you thousands!