here's another example that just sold for $200
the seller's description is below, and despite the title of "possible mule" there is no possibility that it is official.
"Possible Mule of Constantine I/II
Constantine II. As Caesar, A.D. 316-337. Æ follis. 2.24 gm. 18.5 mm. Ticinum mint, 1st officina. His laureate, draped, and cuirassed bust left; CONSTANTINVS IVN NOB C / Camp gate with two turrets, no star above; D N CONSTANTINI MAX AVG around, P(crescent)T in exergue. RIC VII 199 var. (bust right, star above gate). Cf. LRBC 495-499. Good Very Fine; brown patina."