Sharp obverse portrait and interesting reverse error = win. Very nice pickup, indeed! I haven't shown this one in awhile. MAXENTIUS AE Follis. 10.27g, 27.5mm, Carthage mint, 2nd officina, early 307 AD, RIC 57, Failmezgar 123 O: IMP MAXENTIVS PF AVG, laureate head right. R: CONSERVATOR AFRICAE SVAE, SE-F in field, Africa standing left, wearing elephant skin headdress and holding signum and tusk, at feet to left a lion with captured bull; B (for 2nd officina) in exergue. Notes: Second last issue to be struck in Carthage before Domitius Alexander rebelled against Maxentius in 308 and took the city.
I've got a constantius ii which is double struck and 50 percent off the flan - don't know what happened to the mint worker, too much wine I guess.