Modifiche

The [[51]] had a number of changes in the following years, such as switching in 1948 to a new the filling system called ''[[aerometric]]'', the creation of different versions, including some luxury models in precious metals or with complex decorations for the metal cap. Some of these are extremely rare and highly sought after by collectors.

The [[51]] had a number of changes in the following years, such as switching in [[1948]] to a new the filling system called ''[[aerometric]]'', the creation of different versions, including some luxury models in precious metals or with complex decorations for the metal cap. Some of these are extremely rare and highly sought after by collectors.