20 Most Valuable Coin 1. Diadumenian, as Caesar (AD 217-218). AV aureus (19mm, 7.22 gm, 1h). NGC (photo-certificate) Choice AU ★ 5/5 - 4/5, Fine Style. Rome, AD 218. M OPEL ANT DIADVMENIAN CAES, bareheaded, draped and cuirassed bust of Diadumenian right, seen from behind / SPES PVBLICA, Spes walking left, flower upward in right hand, raising folds of her skirt with left. RIC IV, Part II, 115. Calicó 2984a. Extremely well-struck with high-relief obverse from realistic dies of fine style. Sold For: $ 336000.00 Read More: 2. Sextus Pompey, as Imperator (44-36 BC). AV aureus (20mm, 7.95 gm, 6h). NGC (photo-certificate) Choice AU ★ 5/5 - 4/5, Fine Style. Sicily, 42-40 BC or 37/6 BC. MAG • PIVS •-IMP • ITER, bare head of bearded Sextus Pompeius right; all within oak wreath / PRAEF / CLAS • ET • ORAE / MARIT • EX • S • C (AE and MAR ligate), heads of Pompeius Magnus on left, and Gnaeus Pompeius on right, facing each other; lituus right in left field, tripod in right fiel