Watch List notes:

Maximian (286-310). AR 19 mm, 298-299, Trier mint. Head right, laureate. / Diocletian, Maximian, Constantius Chlorus and Galerius sacrificing over tripod; behind, gate in six-turreted enclosure. RIC VI 114b. AR. 3.06 g. 19.00 mm. Toned. About EF/VF.

This reverse type was issued to propagate the tetrarchy, the new form of government introduced by Diocletian in 293 AD.