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
Gold Coin as Imperial Currency
The Roman monetary system was based on the two precious metals circulating side by side and in a fixed relation to each other, gold being given and taken according to weight,(112) silver in the form of coin; but practically in consequence of the extensive transmarine intercourse the gold far preponderated over the silver.
112. The gold pieces, which Sulla (iv. 179) and contemporarily Pompeius caused to be struck, both in small quantity, do not invalidate this proposition; for they probably came to be taken solely by weight just like the golden Phillippei which were in circulation even down to Caesar's time. They are certainly remarkable, because they anticipate the Caesarian imperial gold just as Sulla's regency anticipated the new monarchy.
Whether the acceptance of Roman silver money was not even at an earlier period obligatory throughout the empire, is uncertain; at any rate uncoined gold essentially supplied the place of imperial money throughout the Roman territory, the more so as the Romans had prohibited the coining of gold in all the provinces and client- states, and the -denarius- had, in addition to Italy, de jure or de facto naturalized itself in Cisalpine Gaul, in Sicily, in Spain and various other places, especially in the west.(113)
113. Cf. IV. XI. Token-Money
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=175