Gallienus (253-268 A.D.) -  AE Antoninianus - 19.46mm, 3.37gr
Obverse - GALLIENVS AVG
Gallienus, his radiate head right
Reverse - PAX AVG,
T in right field.
Pax standing left, holding olive branch and scepter.

Minted in Rome between 260-268 A.D.
Reference:
Webb, P.H., "Roman Imperial Coinage", Volume 5, Part 1 (RIC), p153, nr 256 (under sole reign of Gallienus)
Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Vol. 3, p297, nr. 10300, variety from Rome mint
Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p263, nr. 2984
Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 5, p413, nr. 727
Seaby, H.A. & Sear, D.R., "Roman Silver Coins" (RSC), Volume 4, p86, nr. 727
Van Meter, D., "Handbook of Roman Imperial Coins", p247, nr 194
Suarez, R., "Encyclopedia of Roman Imperial Coins" (ERIC),  p300, nr.53, variety Exe: T, (B23, O09, R214, T166, M5)
Quality: Fine+