Watch List notes:

Probus, 276-282. Antoninianus (Billon, 24 mm, 3.61 g, 11 h), Ticinum, 4th officina, 280. VIRTVS PROBI AVG Radiate, helmeted and cuirassed bust of Probus to left, holding spear over his left shoulder, and decorated shield over the right. Rev. MARTI PACIF /QXXI Mars advancing to right, holding olive branch, spear, and shield. RIC 509 var (without I and star). A rare variety; sharp, clear and well struck. Very fine.