Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
It was the Indians and Greeks who first independently
of each other and by very divergent methods created, out of the
Aramaean consonantal writing brought to them by commerce, a complete
alphabet by the addition of the vowels--which was effected by the
application of four letters, which the Greeks did not use as consonantal
signs, for the four vowels -a -e -i -o, and by the formation of a
new sign for -u --in other words by the introduction of the syllable
into writing instead of the mere consonant, or, as Palamedes says
in Euripides,
This Aramaeo-Greek alphabet was accordingly brought to the
Italians through the medium, doubtless, of the Italian Greeks;
not, however, through the agricultural colonies of Magna Graecia,
but through the merchants possibly of Cumae or Tarentum, by whom it
would be brought in the first instance to the very ancient emporia
of international traffic in Latium and Etruria--to Rome and Caere.