I've been looking real closely at the pictures of the marking (the pistol is actually in storage right now), and I noticed that the "I" is definately taller than the rest of the characters.
I am wondering if it could be the Roman numeral "I" instead.
The other characters seem to be pretty much the same size.
Whether that makes any difference in the translation (Landwehr, Leib, Lehr), maybe not.
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