An original D&J Improved Capper (Dixon & Johnson), a precision-made brass percussion cap dispenser designed for black powder muzzle-loading firearms. The design allows for the secure storage, rapid loading, and single-handed application of percussion caps onto the nipple of the firearm. Manufactured from solid brass with concentric circle design and rear mounting ring, this model features the typical spring-fed rotating internal mechanism for feeding caps forward.Such cappers were widely used by both civilian shooters and military units employing percussion lock rifles and pistols throughout the 19th century. The "improved" designation refers to its enhanced reliability over earlier simple strip or linear cappers.The example you’ve presented is in very good condition, with the maker’s mark "D&J Improved" still crisp and legible.