Watch List notes:

Diocletian (AD 284-305), AE Nummus (27.1 x 28.0 mm 8.40 g 6h), London mint c. AD 296-303, IMP C DIOCLETIANVS P F AVG, laureate, cuirassed bust of Diocletian right, rev. GENIO POPVLI ROMANI, Genius standing left holding patera and cornucopia (RIC 6a/16A; CT 2.01.003, extremely fine.
Ex Toone collection.

This portrait clearly resembles that of Allectus

(£200 - £300)