A Rifled Percussion Over & Under Pistol. With browned sighted barrels engraved with a band around the muzzle and fitted with a captive ramrod below, engraved, ‘HIS ROYAL ROYAL HIGHNESS NAYEBUL’ along the top flat, profusely engraved box-lock action with hammers decorated en-suite, fitted with a blued belt clip to the lefty hand side, signed ‘LONDON’ along the tang, chequered walnut butt with engraved butt cap with trap, profusely engraved steel trigger guard, stamped with London proofs. 

Notes:

The engraving could be 'His Royal Highness Prince Nayebul Ayadah Farhad Meerza' as I have come across a small group of pistols sold at Christies London in 1999 that all had similar inscriptions on the barrels. 

Dimensions:

Bore: .55 Calibre (28-Bore)

Barrel Length: 19 cm (7.5 Inches)

Overall Length: 32 cm (12.6 Inches)