System for conversion of monetary values whereby a disk or similar is affixed to a coin or note showing its value in another currency, particularly for showing Euro values in old constituent currency values

摘要

System comprises disks (1) or similar devices that can be placed on a coin (2) or banknote and that have the nominal value of the coin or note converted into one or more other currencies, thus enabling a user to immediately know the value of a coin or note in another currency