Watch List notes:

Tacitus. A.D. 275-276. AE antoninianus (22.80 mm, 3.54 g, 6 h). Gallic mint. IMP C M CL TACITVS P F AVG, radiate and cuirassed bust right / MARS VLTOR, Mars advancing right, holding spear and trophy, H in exergue, star in right field. RIC 29. VF. 

Ex Blackmoor Hoard.