SASANIAN KINGS. Khosrau I (531-579 AD). AR Drachm (4.08 gm; 30 mm). "AIRAN" for Susa mint, year 25. Obverse; Khosrau's bust turning right, name in front of face, reverse; fire altar with attendants which is the standard style for the rest of the reign after year 5, mint "AIRAN" for Susa to the right and year 25 to the left. Sunrise 971var. Choice EF. Toned.