Watch List notes:

Diadumenian. As Caesar, AD 217-218. Æ As (25mm, 13.01 g, 12h). Rome mint. 2nd emission of Macrinus, AD 217-218. Bareheaded, draped, and cuirassed bust right / Diadumenian standing right, holding signum and scepter; aquila and signum to right. RIC IV 212; Clay Issue 2. Near VF, dark brown to black patina with traces of red, some roughness.