I picked up these five ancient/medieval Arabic coins from a dealer's junk bin. Number 3 is supposedly North African, but I am not sure. Can anyone tell me anything about these?
Coin 1- AR, 6.28 g, 25 mm. Appears almost to have been struck on native silver rather than a prepared flan due to the shape and cracked appearance of the surface.


Edge detail.

Coin 2- AR, 1.42 g, 16 mm.


Coin 3- AR, 1.49 g, 15 mm across, 22.5 mm diagonal. Square.


Coin 4- AE, 4.59 g, 22 mm.


Coin 5- AE, 4.89 g, 20.5 mm. Same as no. 4.


Thanks.