Watch List notes:

Constantius I as Caesar (293-305 AD). AR Argenteus, Rome mint, 295-297 AD. D/ Head right, laureate. R/ Diocletian, Maximian, Constantius Chlorus and Galerius sacrificing over tripod; behind, gate in a six-turreted enclosure. RIC 38a. AR. g. 2.97 mm. 18.00 RR. Weakness. Enchanting patina with iridescent hues. About FDC.

This type was struck to stress the unity of the two Augustii and two Caesares in the tetrarchy, the new form of government.