Seems to be a Grade 5 rather than a 6, but a 4 frame Grade 5 is a scarce bird. A PGCA letter of provenance may shed some light on the identity of the original purchaser. The "5" stamped on the water table with the serial number is the grade. The "6" stamped on the barrel flat is the weight in pounds of the unfinished barrels. If the unfinished barrel weight had not been in even pounds, the ounces would have been stamped in smaller letters next to the "6". A great gun, with great provenance, and maybe more to come.
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