Constans UK found
Size 20x22mm Weight: 4.8 grams
Obverse:  DN CONSTANS PF AVG, Pearl diademed draped bust right
Reverse:  FEL TEMP REPARATIO, Emperor on Galley holding banner with Chi-Rho Christogram, Victory on Globe crowning him and Galley piloted by Victory

Constans is not holding a Phoenix