I will let the artillery collectors comment on value Mike...
But I wanted you to know that the small strap tha pierces the front of the holster is what is called a "lifting" strap. The muzzle goes over it as the pistol is inserted in the holster.
When the weapon is seated in the holster it is hard to remove... the purpose of this strap is to raise the grip high enough to lift the pistol out of the holster. This is done by pulling on the sewn end that sticks out of the front of the holster and as the strap gets tighter inside the pistol is lifted to an appropriate position to be withdrawn.
Hope this has been helpful...
NICE looking Artillery Mike... too bad the holster/stock isn't numbered to the gun, but it sure is in good shape too...
Where ever Pistol # 5136e is now, I am sure it feels pretty naked without it!