The latest hammerless damascus barrels are SN 220,657 GH D3 1927, SN 222,845 DHE D4 1927, and SN 227,020 VHE D3 1928. I don't know the gauges though and maybe someone would kindly check the book.
Don: the case colors should be as bright as the bores. If the colors are faded or worn, the barrels may have been honed.
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