A Percussion D.B. Box-Lock Pocket Pistol by Lang, circa 1840-50. With turn-off barrels each cut for a barrel-key and engraved with a band of foliage around the muzzle, retaining traces of case-hardening and numbered '0' and '1' respectively at the breech, breeches numbered to correspond and engraved with a starburst in the sighting groove, border engraved action signed on a scroll over each side amid flowering scrolling foliage, thumbpiece safety-catch decorated en suite, dolphin hammers, folding triggers with faint traces of blueing, figured swelling rounded butt, and vacant silver escutcheon, London proof marks.

LANG

Joseph Gunmaker (opened as Gun & Pistol Repository from Wilson’s Warehouse, Vigo Lane) 7 Haymarket, 1925-52 (Shooting Gallery adjoining from 1827) 22 Cockspur St., Charing Cross, 1853-74. Became Joseph Lang & Sons, eventually amalgamating with Stephen Grant, Exhibited 4 and 6 barrel revolvers, Great Exhibition, 1851. Popularised the pin-fire breechloader. Died 1869. 

Howard L. Blackmore (1986) Gunmakers Of London, 1350-1850. George Shumway Publisher. USA. 

Dimensions:

Bore: 80 Bore

Barrel Length: 1.5 Inches (3.81 cm)

Overall Length: 5 Inches (12.70 cm)