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
The economic relations of this epoch are clearly mirrored to
us even now in the Roman monetary system. Its treatment shows
throughout the sagacious merchant. For long gold and silver stood
side by side as general means of payment on such a footing that,
while for the purpose of general cash-balances a fixed ratio of
value was legally laid down between the two metals,(39) the giving
one metal for the other was not, as a rule, optional, but payment
was to be in gold or silver according to the tenor of the bond.
In this way the great evils were avoided, that are otherwise
inevitably associated with the setting up of two precious metals;
the severe gold crises--as about 600, for instance, when in
consequence of the discovery of the Tauriscan gold-seams(40) gold
as compared with silver fell at once in Italy about 33 1/3 per
cent--exercised at least no direct influence on the silver money
and retail transactions.
