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
The sacred records of the Samnites as well as of the priesthood of Anagnia were inscribed on linen rolls, and so were the oldest lists of the Roman magistrates preserved in the temple of the goddess of recollection (-Iuno moneta-) on the Capitol. It is scarcely necessary to recall further proofs in the primitive marking of the pastured cattle (-scriptura-), in the mode of addressing the senate, "fathers and enrolled" (-patres conscripti-), and in the great antiquity of the books of oracles, the clan-registers, and the Alban and Roman calendars.
When Roman tradition speaks of halls in the Forum, where the boys and girls of quality were taught to read and write, already in the earliest times of the republic, the statement may be, but is not necessarily to be deemed, an invention. We have been deprived of information as to the early Roman history, not in consequence of the want of a knowledge of writing, or even perhaps of the lack of documents, but in consequence of the incapacity of the historians of the succeeding age, which was called to investigate the history, to work out the materials furnished by the archives, and of the perversity which led them to desire for the earliest epoch a delineation of motives and of characters, accounts of battles and narratives of revolutions, and while engaged in inventing these, to neglect what the extant written tradition would not have refused to yield to the serious and self-denying inquirer.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/1-14-measuring-writing.asp?pg=27