1⁄12 Shilling - Elizabeth II Charles II Proof mule

This piece is a mule — struck using obverse and reverse dies from two different coin types, combining Elizabeth II and Charles II elements that were never intended to pair. Such errors at official mints are rarely accidental in the conventional sense; they typically occur during die storage mix-ups or when proof sets are assembled under deadline pressure. Jersey's proof coinage of this period was produced at the Royal Mint, where multiple small-denomination dies for various Commonwealth territories were handled simultaneously.

KM#24 is the standard Charles II commemorative type; the mule designation places this outside that classification entirely.