Watch List notes:

AQ QOYUNLU: Hasan, 1453-1478, AR 4/3 tanka (6.82g), Urdu (the military mint), AH875, A-2512U, special type, to be associated with the Aq Qoyunlu defeat of the Ottoman forces and the occupation of Erzincan in AH875, unreported and probably unique, lovely VF, RRR. The key for the relationship to the Ottoman defeat is the numeral "5" in the date, which is engraved in the form found on Ottoman akçes dated 875 (struck 875-885 with frozen date 875), as on this piece, but very different from the "5" on other Aq Qoyunlu coins dated 875 (or 885, 895, etc.). This suggests that an Ottoman engraver was hired by Uzun Hasan's forces to engrave the dies for this piece, which might have been conceived as a "commemorative", struck to a special increased weight.

Estimate: 200-300 USD