Watch List notes:

'Abbasid Caliphate. Al-Muqtadir. AH 295-320 / AD 908-932. AR Dirham (20.1mm, 3.11 g, 2h). Tarsus mint. Dated AH 307 (AD 919/20). Cf. SICA 4, 674 (dated AH 308); Album 246.2. Centers weak. Fair, but mint and date very clear. Extremely rare.

This appears to be an unpublished date for dirhams from the important Biblical city of Tarsus.