The collection of the Winterthur Coin Cabinet (Münzkabinett Winterthur) includes a bronze coin of King Philopator (II.?) of Cilicia. The dated coin shows a known type of this king, but uses an era different from the one used on other coins of the same type. This raises questions about the use of different eras in the coinage of one realm, city, or even the same ruler. The paper thus tries to provide a possible answer as to when and why some coins were dated, while the majority of the same type was not.