Dwight, not trying to make you mad, but I disagree totally.
The examples you have shown, I would say it is a good chance they are hardness testing... But this example, I see no reason to poke a dot after each serial number. I can't see a consistent dot after each ending of a number to be anything but on purpose?
If a "random" dot equals hardness testing, then it doesn't make sense to take your time and ensure it is after the last number in so many places.
Whether for a certain city or to show a difference in a number (maybe easier to distinguish a same numbered luger by dots, then to mark it with the "3rd" digit ala "The Dutch Luger"?
Ed
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