An Early Brass-Barrelled Flintlock Blunderbuss by Spencer, Early 18th Century. With three-stage barrel flared at the muzzle, octagonal breech becoming round, decorated with scrolling foliage and stamped with London proofs and barrel smiths mark, tang decorated en suite, plain signed lock, full-stocked in walnut (area of wood replaced in front of the lock) brass mounts including plain butt-plate secured with iron tacks, simple brass trigger guard and turned brass ramrod pipes, wooden rammer. A scarce early blunderbuss. 

Spencer

James Apprenticed to Thomas Towle, turned over to John Tarles, 1678; free of Gunmakers Co., 1686. Proof piece, 1687. Gunmaker to Ordnance, 1627-30; for Blacksmiths Co., 1632. 

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