GS was an Italian brand of motorcycles that was founded by Guidetti, engineer Alberico Seiling brothers and Nunzio Silvestri. The brothers Alberico and Guidetti Seiling had experience working with MAS in Milan. In 1950 they developed a 50 cc Gioiello the name means "jewel" under the name HS Motori Gioiello. It was an 38 cc auxiliary engine. The engine was mounted just under the saddle of a bicycle and was also produced in Brazil.
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