That's a nice example covered in suncorite. Other's may be able to ascertain the markings. A nice khaki holster can be found on Ebay, Gun Broker or just about any gun show. Beware of fakes or reproductions. You should be able to find a nice WW2 P-37 for under $40. I just scored a nice Air Ministry 1940 RAF holster and ammo pouch for $27. They are out their just have to look in the right places.