[Edward Tinker]

Sverre, I can take a stab at it.

Generally WW2 Police holsters were made in Berlin, this part makes it look like it says Karlsruhe: deutches?????en fabrik ka???ruhe 1,b

Which is very possible.

These markings can mean several things, I don't think it is a rework of a military holster.

P.B For the police, P.B. does not have an exact match.

S.B.5532 & 9631 could mean; S = Schutzpolizie (municipal police force) B = Berlin, the or 9631 5532 would the weapon number

Of course it depends on the placement, but I am guessing that the P.B. and then the S.B., were each assigned to a weapon and the holster changed locations, but this is strictly a guess.

and inside the flap it is stamped:
19?8

So either 1918, 1928 or 1938, I would guess 1928, although 1938 is also possible. If it was 1918, then the holster should show as a rework, as it was after 1918 that this type of holster was used for the police.

Ed