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
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.