10 Pounds - Charles III Royal Dragon; Silver Piedfort

The piedfort format — double the thickness of a standard strike from the same dies — originated as a French monetary tradition dating to the medieval period, used initially to produce presentation pieces for assay verification and royal gifts. The Royal Mint adopted the format for collector issues in the modern era, and it has since become a reliable premium tier in their annual bullion and proof programs.

At 312.59 g, this piece sits near the ten-troy-ounce mark by design.