Watch List notes:

Abbasid, temp. al-Ma'mun, Dirham, Madinat Samarqand 202h, citing Dhu'l-Riyasatayn, 2.90g (SNAT XVa:633; Tiesenhausen 2836; A 223.4). Very fine and very rare.
Most Samarqand dirhams of this date bear the name of the heir al-Rida.

Estimate: £100-120