Augustus (27 B.C. - 14 A.D.) - Silver Denarius - 20.55mm, 3.77gr
Obverse - CAESAR AVGVSTVS DIVI F PATER PATRIAE
Augustus, his laureate head right
Reverse -  AVGVSTI F COS DESIG PRINC IVVENT
C L CAESARES  in Exergue
Caius and Lucius Caesar standing, each holding
 a shield and spear between them, a lituus (on left)
and simplum (on right) above (each turned inward).
Image
The image above is my own scan with a flatbed scanner, while I  took the image below with a digital camera.
Photo of the coin
Minted in Lugdunum (Lyon, France), 2 B.C.- 4 A.D., probably conitinued for several years afterwards.

Reference:
Sutherland, C.H.V.,"Roman Imperial Coinage", Volume 1, revised edition (RIC), p56, nr.210
Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Volume 1, p317, nr.1597, var. with lituus l and simplum r.
Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p96, nr.479, var. with lituus l and simplum r.
Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain"(C), Volume 1, p69, nr. 43.
Seaby, H.A., "Roman Silver Coins" (RSC), Volume 1, p134, nr.43c.
Mattingly, H., "Coins of the Roman Empire in the British Museum", Volume 1 (BMC), p91, nr. 540-543.
Van Meter, D., "Handbook of Roman Imperial Coins", p67, nr.51.
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II),  p10, nr.429 (B5, O40, R013, T042 Exe: C L CAESARES)
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II-digital), p9, nr.429 (B5, O40, R013, T042 Exe: C L CAESARES)
Kampmann, U., "Die Münzen der römischen Kaiserzeit" (K, 2e Auflage), p43, nr. 2.50, var. with lituus l and simplum r.

Quality: Extra Fine-, some minor traces of chemical cleaning on obverse.
Rarity: S (Scarce)