Thanks builder. We're still working on the fused 'JP', which has also been found on an 1894 Pigeon gun with Etoile damascus. 'JP' was used by Jacques Pirotte & Fils., but Littlegun has them in business only 1910-1962. A likely suspect is Jules Pire & Cie, established in 1885
http://www.littlegun.be/arme%20belge/artisans%20identifies%20p/a%20pire%20gb.htm