Originally Posted by
gato naranja
That's a typical P-08 hardshell holster. Some of the older German holsters will have makers' names stamped on the back (such as "Karl Akva, AG" or some such thing), but as time went on German leather gear got more "mysterious" by having either the maker's code or an "RB" ID number... or no maker's identification at all.
That little tool is a combination magazine loader (put the P-08 magazine follower button in the hole with the little 90-degree "wing" outward and below, and press the follower down with your thumb via the "wing") and "takedown tool" (the screwdriver fits the grip screws on a P-08). Almost all P-08 holsters I saw seemed to still have them, and some of them must have done some traveling to end up where they did, because I would occasionally run across ones that had marks consistent with WWI manufacture.
My favorite uncle had a small batch of souvenirs he brought back, and when he'd trot them out at my request, the leather gear had a unique smell that I still recall after all these years (it was not the "Ballistol" scent). I would not apply anything to try and preserve the leather, although a little neutral wax leather polish generally won't hurt things. The best thing a person can do is keep a holster in a stable environment that is neither too hot nor too cold, and not where the leather will dry out too much.
(And if you value the pistol, don't keep it in the holster.)