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ʿAbbāsid Medallion of Khalīf al Muqtadir Billāh, 908-932AD
Asia, Iraq. Horseman. Coin of the Abbasids. 908-30 AD. Silver.
Source: Diomedia
The image may be reversed.
A similar (but reversed) medallion is referenced as figure 315 in The military technology of classical Islam by D Nicolle
315. Medallion of Khalīf al Muqtadir Billāh, 908-932 AD, ʿAbbāsid, Münzkabinett, Staatliche Museen Dahlem, West Berlin (Kau).