Is it definitely an Erfurt proof, or a Crown/RC rework stamp? There were very few rework stamps in DWM, but some did exist.
Is there any documentation of the bring-back. If not, believe the gun not the story.
If buying, treat it as a mismatch if it didn't leave the factory that way.
You'll have to deal with that if and when it is ever sold again.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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