Nero (54-68 A.D.) - Copper Semis - 20.34mm, 5.34g
Obverse - IMP NERO CAESAR AVG PONT
Nero, his bare head right  Globe at point of bust.
Reverse - CER QVINQ ROMAE CON, S C in Exergue.
Table, seen from front and right, bearing urn on left,
and wreath to right; on the fromt panel a bas-relief of two
sphinxes (or gryphons) confronted; a round shield rests
against table-leg.

Minted in Lugdunum (Lyon, France) in 66 A.D.

The reverse depiction and legend CERTAMEN QVINQVENNALE ROMAE CONSTITVTVM refer to sellisternia
(ritual banquets)
held in conjunction with the Ludi Quinquennalis (also know as Quinquennial Neronia) in Rome
in 60 A.D. and 65 A.D.

Reference:
Sutherland, C.H.V., "Roman Imperial Coinage", Volume 1, revised edition (RIC), p183, nr. 560.
Mattingly, H., "Coins of the Roman Empire in the British Museum", Volume 1 (BMC), p278, nr. 393.
Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Vol 1, p391/392, nr. 1979/1980 var.
Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 1, p283, nr. 47 var
Van Meter, D., "Handbook of Roman Imperial Coins" (VM), p87, nr. 34, var.
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II),  p53, nr. 531  (B02, O16, R11, T40, M3)
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II-Digital),  p49, nr .531  (B02, O16, R11, T40, M3)
Kampmann, U., "Die Münzen der römischen Kaiserzeit", 2nd edition (Kampmann), p43, nr. 14.29.

Quality: Fine+
Rarity:  C (Common)

For comparison, a better specimen on the wildwinds.com websitecan be found here.