A Brief History of the Marque
Motorcycles produced by the Società Reggiana Motocicli of Reggio Emilia, near Modena, and made in two versions: the 500cc Sport model with a horizontally opposed OHV twin with magneto ignition, and the Turismo model which was much the same as the Sport but with a sidevalve engine. In 1924, OHV oil-cooled Bradshaw 350cc singles and 500cc twins were built. The company experienced difficulties and in 1925 the Ladetto brothers of Turin produced a 500cc longitudinally opposed twin cylinder engine.
Sources: MC Storico Conti et al