Both guns are just super, great finds! The holster looks like it has the hard curved flap of either a French revolver holster or the Japanese Nambu or Japanese Type 26 revolver holster. Are there any stamps on the underside of the flap? Both the French and Japanese placed arsenal stamps there. Since the gun came from Austria, I'm thinking it's a French holster for the 11mm Model 1873 or 8mm 1892 Lebel service revolver. The French holster usually has three little cartridge pouches underneath the flap, they held two revolver rounds a piece. I see you have the capture papers as well, these add value in addition to the super condition of the gun itself. It might be interesting to Google the military organization of the officer that signed off on the capture paper, it might give you an idea of some of the gun's history.Congratulations on some fine pistols, I wish I had a Luger like that!