Watch List notes:

SELJUQ OF RUM: Kayqubad I, 1219-1236, AR dirham (2.99g), Konya, AH623, A-1211, cf. Zeno-160208, the date in numerals at reverse 6h, citing the caliph al-Zahir, choice VF, R. This type is the earliest confirmed example of a numeral date on any Islamic silver coin.

Estimate: 75-100 USD