Unpublished in RIC and LMCC, this coin has recently been notified to me. Many thanks to Steve Thomas. Further detail of this coin and a few other new types can be found on the Hookmoor website -
www.hookmoor.comCT 5.04.003.5 IMP CONSTANTINVS P F AVG Bust B2 (z) left ( 28.0 x 27.0 mm 7.06 g 6h). Shield is decorated with two captives seated back to back, trophy between. Steve Thomas collection. The detail of the shield decoration can be seen more clearly on the image below.