JJ, the easiest thing to check is age, pre - and postwar German guns will have distinctively different proof marks. Once you got that nailed down, we can proceed. I had a Roehm 8mm blank/gas gun as a kid that looked strongly like your .25.
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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.
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