Watch List notes:

Constantine I. A.D. 307/10-337. AE nummus (13.94 mm, 1.04 g, 6 h). Constantinople mint, A.D. 330. POP ROMANVS, draped bust of Genius left, with cornucopia on shoulder / Milvian Bridge over the Tiber river; CONS/Θ in exergue. RIC 21; LRBC 1066. Fine, roughness. Rare. 

The reverse depicts the Milvian bridge, where it is reported, Constantine received a vision from God and converted to Christianity.