I think its Swiss, it looks like a pouch I have that I think is Swiss. Mine has leather tabs that has a stamp in it. The stamp is a a square with SZ and a cross over it that looks like the cross on a swiss army knife.
That's definately a Swiss pouch, it's for a ww2 era gas mask. The later ones are a rubberized vinyl that looks a good deal like the West german ones.
That "salt and pepper" canvas pattern is a dead giveaway.