★ An interesting brockage mint error ★

Constantine II (?), as Caesar, 316-337. Follis (Bronze, 19 mm, 3.36 g, 12 h), brockage mint error, Antiochia, 325-326. Incuse of reverse. Rev. PROVIDEN-TIAE CAESS / SMANTI Campgate with no doors and two turrets; above, star. Cf. RIC 65. Attractive earthen highlights. Very fine.

Reverse brockages are suprisingly rare: in the case of this example, the reverse belongs to either Constantine II or Constantius II.