An Extremely Rare and SUBURB Revolutionary War Period British Brass Barrel Flintlock Blunderbuss with spring bayonet by KNUBLEY, LONDON

An Extremely Rare and SUBURB Revolutionary War Period British Brass Barrel Flintlock Blunderbuss with spring bayonet by KNUBLEY, LONDON, c. 1775.  16" octagon to round flaring blunderbuss barrel engraved on the top flat "CHARING CROSS, LONDON" and stamped with (2) oval proofs on the left flat of breech.  Iron trigger guard and spring bayonet.  The bayonet is mounted on the underside of the barrel and is released by a second trigger located behind the firing trigger.  Extremely rare Queen Anne style firing mechanism with sliding safety built into a box-lock frame and is maker engraved "KNUBLEY" on the left side.  The tang of the brass frame is engraved with a panoply-of-arms and the owners initials "R H C" (unidentified but have been told it could be Royal Highness of Clarence, Duke of Clarence who was King George III third son).  The blunderbuss is in its original flintlock configuration.  The stock has wonderful checkering on the wrist and is solid with light scratches and dings from