Constantine  I Magnus (307-337 A.D.) -  AE3 Nummus - 19.01mm, 3.35gr
Obverse - CONSTANTINVS AVG
Constantine, his laureate head right.
Reverse - SARMATIA DEVICTA, SIRM in Exergue
Victory walking left, holding a trophy and palm branch, a captive at her feet
(refers to a major victory over the Sarmatians in ca. 322 A.D.)

Minted in Sirmium (Sremska Mitrovica, Serbia) between 324 and 325 A.D.
Reference:
Bruun, P.M., "Roman Imperial Coinage", Volume 7 (RIC), Sirmium, p475, nr 48, obverse 1-B1
Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D.", nr 285CI, Plate 18
Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p326, nr 3880, variety with SIRM mint mark
Carson, Hill, & Kent, "Late Roman Bronze Coinage" (LRBC), Part I, p20, nr 802
Van Meter, D., "Handbook of Roman Imperial Coins", p292, nr 87
Quality: Fine+