Here are some additional pictures of the marks on the barrels (sorry for the photo quality - phone camera):
This is a photo of the crest on the stock oval:
As indicated in one photo, the letter D is stamped on the bottom rib between the fore-end loop and the barrel flats, and the letter B is stamped next to the fore-end loop. There are also two script letters stamped on the bottom of the right barrel next the barrel flats that I could not capture clearly. The second letter is a W, the first letter was either an S or a G.
The SN on the barrels is not stamped on the action or fore-end.
