Watch List notes:

Auction 88 Part II
The Roman Empire
Diocletian, 284 – 305

Argenteus, Ticinum circa 294, AR 3.21 g. Laureate head r. Rev. Six-turreted camp gate with the four tetrarchs swearing over tripod. C 516. RIC 14a. Sisak hoard 24.
Reverse slightly off-centre, otherwise fdc