The tapped holes are not for a Benke-Thiemann stock. The B-T stock is attached to the Luger by the grip plates on the stock and just uses the existing grip screws to secure it. I have seen a couple of early Lugers with a tapped hole(s) in the back strap and have heard of some others. I think they were gun smith modifications for custom built stocks. I have never seen such a stock and I keep hoping one will turn up so I will know what they looked like. If I were to guess, I would think they would be a skeleton frame stock attached by a thumb screw like the old Stevens bicycle rifles.
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If it's made after 1918...it's a reproduction
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