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
This, as is well known, forms the reason why Etruscan art, the stunted daughter, was so long regarded as the mother, of Greek art. Still more even than the rigid adherence to the style traditionally transmitted in the older branches of art, the sadly inferior handling of those branches that came into vogue afterwards, particularly of sculpture in stone and of copper-casting as applied to coins, shows how quickly the spirit of Etruscan art evaporated.
Equally instructive are the painted vases, which are found in so enormous numbers in the later Etruscan tombs. Had these come into current use among the Etruscans as early as the metal plates decorated with contouring or the painted terra-cottas, beyond doubt they would have learned to manufacture them at home in considerable quantity, and of a quality at least relatively good; but at the period at which this luxury arose, the power of independent reproduction wholly failed--as the isolated vases provided with Etruscan inscriptions show--and they contented themselves with buying instead of making them.
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Reference address : https://www.ellopos.net/elpenor/rome/2-09-art-science.asp?pg=48