Not exactly the best-looking or rarest FEL TEMP, but quite an interesting issue for Constans, and for 13$ postage included, you cannot go wrong:
CONSTANS AE2 24mm 5.20g Maiorina/Centenionalis (VF, flat strike areas)
AV: DN CONSTA - NS PF AVG; pearl-diademed draped cuirassed bust r.
REV: FEL TEMP R - EPARATIO; soldier spearing fallen horseman wearing phrigian helmet.
EXE: SARL* Arles mint.
REF: RIC VIII Arles 103, rated R, 348-350AD.