MIDRARID: al-Shakir, 933-958, AV dinar (3.84g), NM (Sijilmasa), AH341, A-453, bold strike, clear mint & date, VF to EF, RR. This is first example dated AH341 that I have confirmed, on which one could determine whether or not the title Amir al-Mu'minin was added as early as 340. Now it should not be earlier than 341.
Estimate: 500- 600 USD