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I've never seen one so marked, but... any possibility that it was originally a 22LR revolver that had it's chambers opened up to accept the 22WMR way back when. If that is so, it was at least nice of someone to mark it. I have seen a few 22LR singleshot rifles that had been reamed. Normally if they were sold a while later the new owner knew nothing of the conversion. Just thought.
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