Gallienus (253-268 A.D.) -  AE Antoninianus - 20.10mm, 2.46g
Obverse - IMP C P LIC GALLIENVS PF AVG Gallienus, his radiate, draped and cuirassed bust right	Reverse - VIRTVS AVGG Gallienus and Valerian I standing facing. Gallienus holding spear and globe, Valerian holding victory and transverse spear.
The image below was photographed by Heritage Auctions Europe. The image above is my own scan.
Minted in Antioch (Antakya, Turkey) or Samosata (Samsat, Turkey) in 255-256 A.D. during his joint reign with Valerian I. Reference: Webb, P.H., "Roman Imperial Coinage", Volume 5, Part 1 (RIC), p104, nr. 456 (under Gallienus joint reign). Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Vol. 3, p305, nr. 10414 var. Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p264, nr. 3003. Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 5, p466-467, nr. 1310. Seaby, H.A., "Roman Silver Coins" (RSC), Volume 4, p108, nr. 1310. Van Meter, David, "Handbook of Roman Imperial Coins" (VM), p250, nr 345. Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC II),  unlisted, (B57, O24, R408, T84, M1 or M6) Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II-Digital),  unlisted (B57, O24, R408, T84, M1 or M6). Kampmann, U., "Die Münzen der römischen Kaiserzeit", 2nd edition, (Kampmann) p322, nr. 90.215.3. Quality: Very Fine+ Rarity: C (Common)