Magnentius AE4, 4,75 gr.

Obv: DN MAGNEN-TIVS PF AVG, laurel and rosette-diademed,
 draped, cuirassed bust right, A behind bust
Rev: FEL TEMP REP-ARATIO, soldier spearing fallen 
horseman who is wearing a Phrygian helmet, sitting 
on ground, arm up, A in left field, SARL in ex.

RIC VIII Arles 133, rated rare.

This is the rarest Fel Temp of them all. 

sold on ebay by lucernae (Spain), August 2009