Mary,
Your two coins appear to be identical with each other, therefore modern replicas; no two genuine
ancient coins of the same
type are ever exactly identical.
You show the back sides only; apparently copied from the
aureus type of
Licinius I (
Roman emperor 308-324 AD) shown below, with
reverseGLORIA EXE - RCITI
AVGG NN, The
Glory of the Army of our Two Emperors, Emperor on horseback left, below ground line
mintmark PR (
Rome, first workshop).
Obverse LICINI - VS
P F AVG,
his head right wearing
laurel wreath.
The original, as you see, is in gold not silver, and very
rare; maybe only two known, namely the specimen shown here, from a
Spanish auction in
CoinArchives, and another reproduced in
Calico, The
Roman Aurei, no. 5093.
The appearance of your replicas in silver, however, makes me wonder: maybe the
aurei too are just modern inventions? And indeed: the
Calico coin is in Forvm's
fake reports as a
fake, shown alongside a similar gold example which is stated to be genuine.