Watch List notes:

Anonymous. A.D. 81-161. AE quadrans (18 mm, 2.26 g, 6 h). Time of Domitian to Antoninus Pius. Rome mint. Helmeted and cuirassed bust of Mars right / S-C, cuirass. RIC 19. VF, some smoothing. 

From the Joseph Donzanti Collection; Ex CNG, from the Bruce R. Brace Collection.