Piece romaine octavian as augustus

Je possede une piece, et aimerais connaitre sa valeur et ou peut on la vendre ? merci "A Rare and Magnificent Roman Silver Denarius of Augustus (27 B.C.E.-14 C.E.), an Exceptional Commemoration of the Subjugation of Armenia The Roman Empire Octavian as Augustus, 27 BC – 14 AD Denarius, Pergamum circa 19-18 BC, AR 3.81 g. Bare head r. Rev. CAESAR – DIVI F / ARMEN – RECEP / IMP – VIII Armenian standing facing, holding spear in r. hand and resting l. on bow set on ground. C 58. BMC p. 109 note. RIC 518. CBN –. Very rare. Lightly toned, countermark on obverse, otherwise extremely fine