Recently received this pic of several letters on a 1900 Smith hammer gun Twist barrel which could well represent the tube maker or importer. We know 'WR' is William Read and Sons, Boston and the '0' is the grade mark.
So far we've identified the following Belgian maker's marks on damascus barrels used by American gun makers:
L.C. Smith: Bauduin Doyen & Jean-Baptiste Delcour-Dupont
Colt Firearms: Plunger-Riga & Heuse-Riga Fils
Baker: Charles Spirlet, Joseph Joris & Arthur-Delvaux-Heuse
Lefever: Arthur-Delvaux-Heuse & George Laloux
Fox: Jean-Baptiste Delcour-Dupont
Ithaca (Flues): Heuse-Riga Fils
A.J. Aubrey/Meriden Fire Arms Co.: Jean-Baptiste Delcour-Dupont/Canons Delcour, Henri Pieper, Heuse-Riga Fils, and Lucient Clement
http://www.picturetrail.com/sfx/album/view/18490292So close...yet so far