George & Jules Defourny, 11 rue heri, Liege. Jules held 3 patents for shotguns. They were active from 1908-1949.

http://www.damascus-barrels.com/bp.html
Their touch mark was G and J crowned over two cross guns.

There were several Defourny's involved in the Belgian gun trade. You can get some more info at LittleGun:
http://www.littlegun.be/arme%20belge/artisans%20identifies%20d/a%20defourny%20gb.htm

http://www.littlegun.be/arme%20belge/artisans%20identifies%20d/a%20defourny%20a%20j%20gb.htm

http://www.littlegun.be/arme%20belge/artisans%20identifies%20d/a%20defourny%20et%20monnard%20gb.htm

http://www.damascus-barrels.com/bp.html

I have an old catalog for A.J. Defourny, but not G&J Defourny. But you already know that...

Pete

http://www.damascus-barrels.com/Movie.html