Watch List notes:

Seljuqs, Rum. 'Izz al-Din Kay Ka'us II b. Kay Khusraw. Second reign over western Rum Seljuq, AH 655-658 / AD 1257-1260. AV Dinar (23.3mm, 4.05 g, 3h). Qunya mint. Dated AH 657 (AD 1258/9). Broome 379 ('unique') = Artuk 1141 (same obverse die); Album A1231. Near VF. Extremely rare.

This coin was struck in the year following the execution of al-Musta'sim, the last of the 'Abbasids. It was issued in the name of Kay Ka'us II alone, without the name of any caliph.