A Rare Cased 13-Bore Percussion D.B. Sporting Gun By Thomas Boss, 73 St. James's Street, London, No. 778 For 1847

engraved owner's border case-hardened foliage escutcheon tang decorated foliate starburst suite scrolling signed line symmetrical steel blued pointed powder-flask twist serial landscape numbered crest trigger-guard trigger-plate brass-mounted ramrod original finish breeches flat locks hammers mounts butt-plate black pointer flowering silver retaining extra platinum figured fore-end heel repeated ramrod-pipe lined initials leather wallet label exterior marks barrelsmith's sling proof thomas london damascus sighted barrels pierced plug short scrollwork stamped brazier comprising cock fitted case rust sidenail brush interior brass outer travelling elliot christopher sporting boss street inside dolphin half-stock chequered grip finial pineapple form rear accessories including brazier's improved planished shot-flask t-shaped combination tool surface mutton bone nipple-box later maker's trade circular remains cased 13-bore rebrowned cover rare percussion james's 1847 tooled aston