Hi
I'm sorry, but this is not
crusader: it is an Abbasid dinar, of al-Aziz Uthman (589-595 H/ 1193-1198 AD), probably struck in Cairo, as
Balog 184-190, or
Alexandria (
Balog 191-193a).
Due to the double striking on the
reverse (left hand image) I can't confirm the date or
mint, but Uthman's name is clear in the centre of the
obverse (right hand image). The double striking also makes it difficult to be sure, but it doesn't look at all blundered: what I can read matches
Balog.
Best wishes
Alan