8 Gauge. 36" double-keyed barrels. SN: NSN. Browned Damascus pattern finish, color casehardened locks and hammers, iron furniture, checkered walnut stock and forend. Barrel rib marked "REAL TWIST". Belgian proof marks under barrels. Unmarked percussion locks are lightly engraved. Double hammers, double triggers, lightly engraved triggerguard, plain steel buttplate and two ramrod pipes with brass tipped wooden ramrod. German silver escutcheons around two barrel wedge keys. A nice example of a mid-19th century very large bore shotgun.