Vespasian Aureus with repaired buttonhole, transforming the reverse legend from COS VI to COS III.
The coin comes from 25 Cayón Numismática auction in 2015.
Roman Imperial
Vespasian (69–79), Aureus 75, Rome mint
Obverse: head facing right
IMP CAESAR VESPASIANVS AVG
Reverse: advancing bull to the right, COS VI in exerque
Weight 7.2 g