MM

A Bolognese motorcycle manufacturer, operational from 1924 until 1957. Founded by Mario Mazzetti (1895-1964) along with Alfonso Morini, Angelo Mattei and Giuseppe Massi-Mazzi, M.M.'s first model was a 125 cc two-stroke single-cylinder bike launched in 1924 which enjoyed notable success, no doubt in part due to its victories in various competitions.