Hi Dominicus
Your coin is a fals of the Zengid Nur al-Din Mahmud bin Zengi (541-569 H/ AD 1146-1174). These are known dated 558, 561 and 564 H (1163, 1166 and 1169 AD), but unfortunately the marginal
legend on the
reverse is unreadable on yours: all were struck in
Damascus.
A reference would be
Spengler & Sayles 74
The picture below shows the correct orientation.
Best wishes
Alan