Augustus (27 B.C. - 14 A.D.) - Silver Denarius - 18.82mm, 3.26gr
Obverse - AVGVSTVS DIVI F
Augustus, his bare head right
 Reverse - IMP X
Bull butting right
Image
Minted in Lugdunum (Lyon, France) 15-13 B.C.

Reference:
Sutherland, C.H.V., "Roman Imperial Coinage", Volume 1, revised edition (RIC), p52, nr.167a
Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Volume 1, p319, nr.1610
Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 1, p84, nr.137
Seaby, H.A., "Roman Silver Coins" (RSC), Volume 1, p141, nr.137
Mattingly, H., "Coins of the Roman Empire in the British Museum", Volume 1 (BMC), p78, nr. 451-3 (↓ die axis)
Van Meter, D., "Handbook of Roman Imperial Coins", p68, nr.60, variety (a.)
Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC),  p5, nr.33 (B2, O08, R128, T027 Exe: IMP X)
Kampmann, U., "Die Münzen der römischen Kaiserzeit", p41, nr. 2.57.

Quality: Very Fine
Rarity: C