BYZANTINE EMPIRE. John III Ducas-Vatatzes. Emperor of Nicaea, 1222-1254. AV hyperpyron. 4.51 gm. 27 mm. Magnesia mint. Christ enthroned facing / The Virgin Mary on right, crowning the emperor on left. DOC 5. SB 2073. Extremely Fine; choice example, superb for issue; well struck, with attractive red-gold toning.