I don't know if it is true or not, but I have been told that in the late 1800s-early 1900s, the British had the most standardized thread patterns of that era so many weapons builders and other industries used their specifications. I have heard the British thread pattern is also called a "Whitworth" thread or something like that. The Luger grip screws are also British and not metric.
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If it's made after 1918...it's a reproduction
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