http://www.littlegun.be/arme%20belge/artisans%20identifies%20d/a%20delcour%20dupont%20gb.htmJean-Baptiste Delcour-Dupont of Nessonvaux was the father of Lucien & Oscar Delcour and had been a manager for Pieper & Cie before opening his own shop specializing in Damascus barrels. He received a patent for SxS barrels in 1910.
Canons Delcour S.A. was registered in 1921, and remained in business until about 1968 when they were acquired by Fabrique National de Herstal. Canons Delcour used a Crown over D, DC, DDN in a crowned oval, ACIER SECURITAS and ACIER MARTELL.
From "L' Armureire Liegeoise". W.J. Jeffery sourced "Herakles Compound Gun Barrel Steel" from Canons Delcour.
If you could post close up full size in focus images of the barrel pattern, and every mark on the rib, barrel flats and action flats we might be of more help.
