Constantine  I Magnus (307-337 A.D.) -  AE3 - 19.32mm, 2.31gr
Obverse - CONSTANTINVS AVG
Constantine, his laureate head right.
Reverse - DN CONSTANTINI MAX AVG,
Wreath enclosing VOT XX
RP in exergue

Minted at officina P in Rome in 321 A.D.
Reference:
Bruun, P.M., "Roman Imperial Coinage", Volume 7 (RIC), Rome, p321, nr. 237, obverse 1 (B1)
Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D.", nr 325CI
Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p326, nr. 3873
Van Meter, D., "Handbook of Roman Imperial Coins", p291, nr 79
Quality: Fine+