Кокоржицкая, Т.Н.; Корпусова, И.В.
(Материалы по археологии Северного Причерноморья, 2009)
Reckoning counters (jetons) were intended to be used in computation in European equivalent of abacus. These coin-like objects most commonly were usually made from brass or cooper. In the late 14th century the German town ...