Fascinating history! The 1928 Luger has tool marks that demonstrate that the machining was done with a "single point planer". That is why the tool marks are linear. The 1940s Luger has tool marks that indicate the tool was rotating but I wonder if the tool may not have been a "single point" tool rather than and endmill type tool as the marks are not all concentric. It almost looks like the tool got dull and gouged into the work there.
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