Definitely need a grain of salt
As another example (though non-Luger) I recently purchased a early Mauser Hsc rig that fell right between the ending serial for small E/655 with test proof and beginning serial for large E/655 without test proof. It has a large E/655 with test proof which is undocumented by Still but I feel authentic after examination and due to circumstances of the purchase. On your artillery I would have to have other evidence of faking before I would dismiss it.
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