Watch List notes:

Lot of two billon tetradrachms of Diocletian, rev. Bust of Helios. (1) Year 4 = 287/8 AD, 7.45g. Bust of Diocletian laureate right / Radiate, draped bust of Helios right. Emmett 4054/4 (R5, citing ANS). Not in Dattari-Savio, Cologne, Oxford, or BMC. (2) Year 10 = 293/4 AD, 7.19g. Bust of Diocletian laureate, cuirassed right, seen from front, fold of cloak on front shoulder / Radiate, draped bust of Helios right. Dattari-Savio pl. 283, 5697 and 8698. Emmett 4056/10 (R4, citing the first Dattari coin). This second coin might also be year 12 (LI - [B]), a variant which according to Emmett is even rarer (R5).