Constantine II AE Follis, Antioch, 316-340 AD.

Obv: CONSTANTINVS IVN NOB C, laureate, draped, cuirassed bust left.
Rev: PROVIDEN-TIAE CAESS, Campgate, six layers, two turrets, star 
above.

Mintmark SMANTS

RIC VII Antioch 65 

Rarity ratings for officina letters: 
SMANTA, SMANTB, SMANT gamma, SMANT epsilon = R5.
SMANT delta = R2.
SMANTS = R1
SMANTH = R4
SMANTI = R3