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 fresco-paintings, which Gaius Fabius executed in the temple of Health on the Capitol, dedicated in 452, obtained in design and colouring the praise even of connoisseurs trained in Greek art in the Augustan age; and the art-enthusiasts of the empire commended the frescoes of Caere, but with still greater emphasis those of Rome, Lanuvium, and Ardea, as masterpieces of painting. Engraving on metal, which in Latium decorated not the hand-mirror, as in Etruria, but the toilet-casket with its elegant outlines, was practised to a far less extent in Latium and almost exclusively in Praeneste.
There are excellent works of art among the copper mirrors of Etruria as among the caskets of Praeneste; but it was a work of the latter kind, and in fact a work which most probably originated in the workshop of a Praenestine master at this epoch,(41) regarding which it could with truth be affirmed that scarcely another product of the graving of antiquity bears the stamp of an art so finished in its beauty and characteristic expression, and yet so perfectly pure and chaste, as the Ficoroni -cista-.
41. Novius Plautius (Cf. II. VIII. Capital in Rome) cast perhaps only the feet and the group on the lid; the casket itself may have proceeded from an earlier artist, but hardly from any other than a Praenestine, for the use of these caskets was substantially confined to Praeneste.
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Reference address : https://www.ellopos.net/elpenor/rome/2-09-art-science.asp?pg=46