I picked this up at an auction. It was listed as possibly India manufacture which I knew right away to be incorrect. The lock is engraved Dublin Castle and the crown and GR are engraved also. The barrel is 58 caliber and has the proof marks shown that I haven't been able to identify. The pistol has a martial look but I can't find anything like it. I am guessing original parts used to make and restock a pistol or a reworked martial pistol. In any case the lock is quality and throws a shower of sparks and the barrel bore is clean so it will make a great shooter in the worst case. Any help is appreciated.