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Constans AE4 of Cyzicus. AD 337-340, 16 mm.

CONSTA-NS PF AVG, laurel and rosette-diademed, draped and cuirassed bust left.
GLOR-IA EXERC-ITVS, Two soldiers standing facing one another, each holding reversed spear and resting hand on shield; one standard between them.

Mintmark SMK Gamma.

RIC VIII Cyzicus 17A.
Extremely rare. Only one source listed in RIC with the note "confirmation required".