Pitts, this is getting more interesting. In your third picture, the 'wedding band', the engraving around the tubes at the breech end of the barrel, does not correspond to any V grade engraving pattern. This has me wondering, if, as you say, the gun was originally a 28 ga., and the barrels were damaged, and re-tubed, as evidenced by the ring engraved around the tubes, forward of the hinge pin. If that was the case, does the serial number stamped on the side of the barrel lug match the number stamped on the water table and trigger guard?
Since the 'wedding band is characteristic of at least a D grade, perhaps the original barrels were lost, and another set of donor 0 frame barrels were sleeved to 28ga. It is common for barrels to be re-stamped to match the gun's SN when replacements are fitted.
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