BAHRI MAMLUK: Isma'il, 1342-1345, AV dinar (4.88g), al-Qahira, AH747, A-932, Balog 273, as al-salih 'imad al-dunya wa'l-din isma'il bin … muhammad, lovely example with traces of original luster, AU, RR, ex Gamal Amer Collection, ex Islamic Coin Auction 24, Lot 4801. Only 2 examples cited on CoinArchives (this piece, and another which is pierced), none on Zeno. Silver coins of Isma'il are common, but his gold coins are extremely rare.
Estimate: USD 3000 - 4000