Officine Meccaniche (OM) was an Italian car, truck, tractor and locomotive manufacturing company, founded in 1899 in Milan as Societa Anonima Officine Meccaniche (SAOM). The inception of the company had resulted from the merger of two companies,Grondona Comi & C and Miani Silvestri & C. Originally, OM manufactured railway stock. Car production started in 1918, using the plant of the former Brixia-Zust (Brixia-Züst), just after OM took over the Zust car company of Brescia, Northern Italy.