The pattern is European, military or police style. None of the WWII German holsters I have seen have that pebbled appearance, they have all been smooth leather.
probably a post WWII police holster from some east European area. probably.
And for what its worth, like the luggage cases that they call holsters, the spare magazine pouch wasn't ever meant for rapid use. It was just a way to have a spare mag on you, without a separate carrier.
US holsters generally have the idea that one may need to draw and shoot as part of their intended use. Even our full flap holsters are reasonably easy to use in a hurry. European (especially German) holsters are little luggage cases for handguns. Buckles, straps, snaps, maybe even a combination lock are needed to be undone before the case can be opened.
Its a design philosophy thing, I guess. Most US designed guns (and holsters) are made to be able to be operated with just one hand. Many European designs are not. Many European guns do not have safeties that can be operated with the shooting hand, holding the gun in a shooting grip. Many US ones do.
Not a hard and fast rule, but until recent years, this was the general trend.
