Watch List notes:

PHILIP I, (A.D. 244-249), silver antoninianus, Rome mint, (3.50 g), 5th officina, issued 249, obv. radiate, draped and cuirassed bust of Philip to right, around IMP PHILIPPVS AVG, rev. cippus inscribed COS III, around SAECVLARES AVGG, (S.8961, RIC 24c, RSC 193). Toned, struck on a full flan, nearly extremely fine.

Ex RJM Collection and Dmitry Markov with tickets.
This coin was issued to commemorate the 1,000th anniversary of Rome.