CRUSADERS. Crusader Imitations of Islamic Dirhams. Half Dirham (Silver, 11 mm, 1.19 g, 1 h), imitating an Ayyubid half dirham from Dimashq, citing the deceased Ayyubid al-Salih Ismai'l and the deceased Abbasid caliph al-Mustansir, Akka (Acre), date mostly off flan. Album 850A. CCS 4. Metcalf, Crusades, 222 ff. Wäckerlin -. Struck on a somewhat short flan as usual and with a few light scratches, otherwise, good very fine.