Claudius. A.D. 41-54. Æ as brockage. 24 mm. Rome mint. Struck circa A.D. 41-50. His bare head left; [TI] CLAVDIVS CAESAR AVG P M TR P IMP / Incuse of obverse. Good Very Fine; pleasing dark green patina with earthen highlights; small flaw in patina behind neck; rarely seen denomination with such good condition on non-incuse side. In ICG slab graded EF40 (some light marks visible in photo are in plastic, not slab).

Ancient coin brockages as an important source of information about ancient minting techniques are discussed in a detailed article in the latest (2018) publication of The Numismatic Chronicle, Volume 178, published by the Royal Numismatic Society.