Cannon style muzzle on the detachable barrel, with the chamber bearing an "R/B" stamp, London Crown "V" and "GP" proofs, and "COLLUMBELL LONDON" on the top. Border engraved lock plate, with "COLLUMBELL" engraved below the flash pan, and a sunburst pattern on the trigger guard. Smooth stock, with an ornate silver reverse plate, thumb shield and grotesque face buttcap.

As "A", but with the barrel and chamber marked "1" on the upper right side.