You didn't mention the bore diameters, very important. It is unusual for the outside to be honed, more common to see the bores enlarged. The serial number range also indicates the original bore diameters, early guns often larger bore diameter. The seller could have measured the wall thickness incorrectly and everything could be factory original. You are the final judge of wall thickness. Why would he mention the wall thickness without telling you the bore diameter? Don't give up yet.
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