Hi, Bob,
Got a picture of the witness mark? Just because it doesn't line up, doesn't mean it is a rebarrel.
Look at the front of the frame with the gun assembled. If the frame front has been ground back the front of the receiver will protrude a bit; if it is smooth, thats the way it was made.
This is a very interesting gun, bring it by the next Portland gun show for show&tell.
--Dwight
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