Concave Coins Öffentlichkeit Deposited
A name given to such pieces as present the appearance of a shal- low bowl, due to a convex die having been used for the obverse, and a concave one for the reverse.
These nummi scyphati, as they were called, made their appearance as early as the second century B.C. among the Ger- manic tribes inhabiting what is now Bava- ria and Bohemia. Later, tins type of coin was extensively employed by the Byzan- tine Emperors of the eleventh and twelfth centuries.
- Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)