It depends on the variation of Luger.
The type of finish (rust bluing) and the order that the die is stamped (blued then die stamped) determines if you'll see a halo.
The halo is caused by the stress of stretching surface metal that occurs when the die pushes through the surface of the blued metal.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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