I would assume there are many DHE 00 frames with 28 and .410 barrels with the .410 barrels installed later. Maybe all such sets have .410 barrels installed later. My assumption is that many of the total 28 gauge production was before the first .410 barrel set was made. Only Mr. Skeuse could tell us how far along 28 gauge production was before .410 barrels started to become available. If we knew that number, we could at least guess whether a gun was an original 28-.410 set and which ones had retrofit .410 barrels.
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