It is Belgian. It was nitro proofed with 70mm chambers in 1937. The barrels weighed 1.248 kgs at time of proof.

The barrels were made by Delcour-Dupont.
http://www.littlegun.be/arme%20belge/artisans%20identifies%20d/a%20delcour%20dupont%20gb.htm

He continued to produce damascus until Belgium was invaded by Germany.

I can not tell who made the gun. It is very nice.

Pete