Watch List notes:

Diocletian, 284-305. Aureus, Nicomedia 303-304, AV 5.25 g. DIOCLETIA – NVS AVGVSTVS Laureate head r. Rev. XX / DIOCL / ETIAN / I AVG / S M N within wreath. C 549. RIC 13. Lukanc 13. Depeyrot 7/2. Calicó 4593a (these dies).
Very rare. Struck on a very large flan and extremely fine

Ex NAC sale 78, 2014, 1125. From the collection of a Retired Banker.