I think I have found the model numbers of future Maserati.
M182: Grecale
M189: GranTurismo 2, GranCabrio 2
M240: MC20
And some of the abandoned. (I have some confidence in M162, but not so much in M147.)
M147: The car later became Ferrari California
M162: Alfieri, Alfieri Cabrio
Here are those of the past for the reference.
M138: Spyder, Coupé, GranSport
M139: Quattroporte 5
M144: MC12
M145: GranTurismo, GranCabrio
M156: Quattroporte 6
M157: Ghibli 3
M161: Levante
M182: Grecale
M189: GranTurismo 2, GranCabrio 2
M240: MC20
And some of the abandoned. (I have some confidence in M162, but not so much in M147.)
M147: The car later became Ferrari California
M162: Alfieri, Alfieri Cabrio
Here are those of the past for the reference.
M138: Spyder, Coupé, GranSport
M139: Quattroporte 5
M144: MC12
M145: GranTurismo, GranCabrio
M156: Quattroporte 6
M157: Ghibli 3
M161: Levante