Thanks for your reply Peter. The diameter of the drill mark is 3.5mm, I can't find a size for the Waffenamt mark online. Can you recommend any online resources that may be able to help me identify the "J" mark? I believe this would identify the country of origin and be a good place to start, I'm wading through a lot of Google search results but not turning up much yet unfortunately. Going to open it up today maybe there will be another mark of interest on an internal component.
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