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This is an ancient Roman silver denarius, of empress Plautilla, minted at Rome in 202 AD
Obverse: PLAVTILLAE AVGVSTAE, "Empress Plautilla" draped bust right
Reverse: PROPAGO IMPERI, "Enlargement of the empire" Caracalla, togate, standing left, clasping right hands with Plautilla, draped, standing right. This is the marriage ceremony of Caracalla with Plautilla.
A very nice example, toned but with a striking flan crack and grades a good VF
DATE: 202 - 205 AD (this coin minted in 202 AD)
SIZE: 18mm dia
WEIGHT: 3.66 grams
ATTRIBUTION: (RCV 2000 Edition) Number 7073, RIC 362, RSC 21, BMC 406
PROVENANCE: Private collection. Cologne, Germany.