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
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Introduction of Greek Alphabets into Italy
The art of expressing sounds by written signs was of later origin than the art of measurement. The Italians did not any more than the Greeks develop such an art of themselves, although we may discover attempts at such a development in the Italian numeral signs,(10) and possibly also in the primitive Italian custom--formed independently of Greek influence--of drawing lots by means of wooden tablets.
10. Cf. I. XIV. Decimal System
The difficulty which must have attended the first individualizing of sounds--occurring as they do in so great a variety of combinations--is best demonstrated by the fact that a single alphabet propagated from people to people and from generation to generation has sufficed, and still suffices, for the whole of Aramaic, Indian, Graeco-Roman, and modern civilization; and this most important product of the human intellect was the joint creation of the Aramaeans and the Indo-Germans.
The Semitic family of languages, in which the vowel has a subordinate character and never can begin a word, facilitates on that very account the individualizing of the consonants; and it was among the Semites accordingly that the first alphabet--in which the vowels were still wanting--was invented.
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Reference address : https://www.ellopos.net/elpenor/rome/1-14-measuring-writing.asp?pg=16