Constantius Gallus AE2.

Obv: DN CONSTANTIVS IVN NOB C, bare headed, draped, cuirassed bust right, 
 A behind bust

Rev: FEL TEMP RE-PARATIO, soldier spearing fallen horseman. 
 Horseman is bareheaded, reaching backwards.
In fields: Left field: "LXXII" (72 coins to the pound); in centre: S

From the above details, a precise identification is possible as 
RIC VIII Aquileia 194 with mintmark AQP, AQS or AQT
21-22 mm, rated common, (though this is the first one, broken or not, 
 for my large collection of Fel Temps :-) . 

Contributed by Dane, December, 2004.