ERETNID: Eretna, 1335-1352, AR akçe (1.77g), Bayburt, AH750, A-2320.2, type B2, khamsin for "50" retrograde, EF, ex Ruud Schüttenhelm collection. The retrograde khamsin reveals that the dies were probably produced at a single or a limited number or locations, with space for the year left blank until the die was needed. In this case, the local engraver to complete the date forgot to cut the date in retrograde!
Estimate: 75-100 USD