Diocletian. AD 284-305. AV Aureus (20mm, 5.30 g, 6h). Cyzicus mint. Struck AD 290-292. DIOCLETIANVS AVGVSTVS, laureate head right / COS IIII, emperor on horseback right, raising right hand in salutation. RIC V 288; Lukank 4; Depeyrot 9/1; Calicó 4446. In NGC encapsulation 6054938-007, graded Ch AU, Strike: 4/5, Surface: 4/5.
Ex Heritage 3088 (5 November 2020), lot 33036; Florange & Ciani (10 February 1923), lot 190.
Both sides of this aureus show that later Roman rulers paid keen attention to the coinage of rulers from Rome's "Golden Age." The simple obverse legend DIOCLETIANVS AVGVSTVS and the reverse depicting the emperor on horseback, raising his hand in salute, both recall an aureus type struck by Hadrian in AD 125 (RIC II.3 781).