Let's see if I understand what you mean.
Engraving on the action (receiver) and fore end irons but not on the stock. Perhaps you mean checkering.
Etched Damascus barrels, I also understand and this causes ridges between the steel and iron bands.
If I have you correctly, here is what I know.
V.C. Schilling from Suhl, Prussia (Germany) was one of the very few shotgun makers to use these etched barrels. His dates coincide with the hammer gun era. I once owned one of these and it is beautiful and desirable.His mark is an S in a cartouche.
These etched barrels were also used on a few English rifles of that same period.
Look at
http://www.worldpath.net/~jmann/Schilling%2094779%20016.jpgto see the barrels of this gun.
I hope this is helpful.
Best,
John