Watch List notes:

Diocletian. Billon tetradrachm, 7.29g (12h). Year 12 = 295/6 AD. Obv: ΔIOKΛHTIANOC CEB Bust laureate, cuirassed right, seen from front, fold of cloak on front shoulder. Rx: Helmeted, cuirassed bust of Diocletian left, holding spear over shoulder and shield, helmet decorated with figure of Nike advancing left, date IB / L in left field. CNG E317, 18 December 2013, lot 196 (same rev. die). Not in the standard references. This coin is unpublished in the standard references, but a similar reverse type, helmeted bust of emperor or Caesar left, is known for both Maximinianus I (same year 295/6 AD) and for Constantius I as Caesar (preceding year 294/5 AD): see Dattari-Savio pl. 285, 5824, and pl. 289, 6030 and 10751.