Parker D3 3 Iron "Oxford"; more typical of a GH but I've got a BH D3 here
https://docs.google.com/document/d/1...c/edit?tab=t.0
The latest damascus barrels are SN 220,657 GH D3 1927, SN 222,845 DHE D4 1927, SN 227,020 VHE D3 1928, and SN 230234 DH & SN 230760 CHE double trap c. 1928 or 1929 (no record of either available).