The Controller of proof was Christophe Woit (1938-1968). The date stamp a Q is for 1938. The barrels were made by Delcour-Dupont. The barrels weighed 3.32 lbs at time of proof. It was nitro proofed. It has 3" chambers. The barrels are choked, .728 and .724

http://damascus-barrels.com/Belgian_All_Proofmarks.html

Pete