RASULID: al-Mansur 'Umar I, 1229-1249, AR dirham (1.95g), 'Adan, AH635, A-1100.2, type B (central square both sides), clear mint & date, without any weakness, tiny chip at the edge, VF to EF, RRR. Only three examples of type A-1100.2 are on CoinArchives, 1 of 'Adan and 2 of Zabid.
Estimate: 120-160 USD