Watch List notes:

Elagabalus (218-222), Quinarius aureus, Rome, c. AD 218-222; AV (g 2,91; mm 14; h 12); IMP ANTONINVS AV, laureate and draped bust l., Rv. C - O - S III, Mercury standing l., holding purse and caduceus. RIC 163B.
Of the highest rarity, previously mounted on a jewel, very fine - good very fine.

Ex Thesaurus, Auction 2, 15-16 December 2007, lot 434.