Rare .577 Percussion Breech-Loading Mont Storm Patent Naval Rifle with sighted barrel rifled with three clean shallow grooves, retained by two barrel bands, and with bayonet lug on the right at the muzzle, the breech stamped with Hyderabad inventory number on the right, calibrated adjustable back-sight, tip-up breech-block engraved 'MONT STORMS PATENT', tang signed in capitals, border engraved flat lock engraved 'LONDON', figured three-quarter stock, regulation brass mounts, sling loop (the other missing), and steel ramrod numbered '173' (steel parts recoloured), Birmingham proof marks. Ex Bonhams Penrose Collection, Nov 2023. Condition: Overall very good. Sets to full and half cock. All moving parts work well. Category: Weapons & Militaria/Guns & Rifles Estimate: 600-800 GBP