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What makes you so sure that they are Mauser? Have you matched them to a known Mauser butt plate?

I think that he may just have the butt plates and nothing else. When I first read it, and responded, I assumed that he also owned the rifles to which the butt plates attach.

I think that it may be helpful to provide further information and photos of exactly what you have in order to get replies. The problem with Mausers is that they had contracts with many countries...