A counter which can be traced in France to the thirteenth century. Some of the earliest types bear the inscription "de la chambre des comptes," and later issues have portraits, fleurs de lis, the makers' names, etc.
The name is derived from the verb "jeter" to throw, to cast. The pieces originally served the same purpose as the Rechenpfennige (q.v.). They were first struck in copper, brass, and other base metals, but at a later period when they were intended as gifts, they were frequently made of silver and gold.
Tournay was one of the chief manufacturing places of Jetons during the fifteenth and sixteenth centuries.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)