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
In monetary arrangements it was not indeed practicable at once to declare the Roman currency to be the only valid tender in the islands; but it seems from the first to have obtained legal circulation, and in like manner, at least as a rule, the right of coining in precious metals seems to have been withdrawn from the cities in Roman Sicily.(7)
7. The right of coining gold and silver was not monopolized by Rome in the provinces so strictly as in Italy, evidently because gold and silver money not struck after the Roman standard was of less importance. But in their case too the mints were doubtless, as a rule, restricted to the coinage of copper, or at most silver, small money; even the most favourably treated communities of Roman Sicily, such as the Mamertines, the Centuripans, the Halaesines, the Segestans, and also in the main the Pacormitaus coined only copper.
On the other hand not only was the landed property in all Sicily left untouched--the principle, that the land out of Italy fell by right of war to the Romans as private property, was still unknown to this century--but all the Sicilian and Sardinian communities retained self- administration and some sort of autonomy, which indeed was not assured to them in a way legally binding, but was provisionally allowed.
If the democratic constitutions of the communities were everywhere set aside, and in every city the power was transferred to the hands of a council representing the civic aristocracy; and if moreover the Sicilian communities, at least, were required to institute a general valuation corresponding to the Roman census every fifth year; both these measures were only the necessary sequel of subordination to the Roman senate, which in reality could not govern with Greek ἐκκλησίαι, or without a view of the financial and military resources of each dependent community; in the various districts of Italy also the same course was in both respects pursued.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=12