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The barrel for my P89 has what looks like a reversed R stamped on it. What does this indicate?
 

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That's the proof stamp. It's not complete. It's a hand stamp so the punch isn't always straight. It should look like a backwards 'R' with an 'S' intertwined.
 

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The caliber is rollmarked when the barrel is soft. The proofmark comes after the barrel has been hardened. Getting a good-looking proofmark on a barrel that hard by hand is a real chore.
 
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