Well I learned something today! I have an Irish Blunderbuss that is marked Parkinson on the lock and Dublin on the barrel. The barrel and but plate is stamped L-H 639. That tells me it was registered in Louth county. It is also stamped PCA on the underside stock between the toe and trigger guard, What does that mean?
Also, I have another Irish BB, it is marked Elton on the lock and Monaghan on the barrel but without any stampings. I assume it had already left the country when the law went into effect.,,,,Ed