SKYTHIA. Geto-Dacians. Koson, mid 1st century BC. Drachm (Silver, 18 mm, 4.42 g, 12 h), brockage mint error. Olbia. KOΣΩN Roman consul accompanied by two lictors advancing left; before, monogram of OΛB. Rev. Incuse of obverse. RPC I online 1701C. Of the highest rarity as a brockage, perhaps unique. Nicely toned. About extremely fine.


Koson coins are frequently struck from worn dies, and off-center strikes are not uncommon. By contrast, brockage errors such as the present piece are of the greatest rarity; we know of no other examples in either gold or silver other than the two pieces offered here (see lot 2271 above). A brockage results when a coin adheres to one die - typically the reverse, rarely the obverse - and impresses an incuse mirror image onto the next flan.