I was one of the underbidders on this rare type
"Constantine I, 307/310-337. Follis (Bronze, 20 mm, 2.92 g, 12 h), Rome, 318-319. IMP CONSTA-NTINVS AVG Laureate, helmeted and cuirassed bust of Constantine I to right. Rev. SAECVLI F-ELICITAS / P - R / RQ Shield inscribed AVG set on garlanded cippus. RIC 159. Extremely rare and with a very interesting reverse. Very fine."