Bill is correct that Twist/English Skelp performed well in the 1891 Trial
http://docs.google.com/View?docid=dfg2hmx7_242cxhh9hfqDamascus quality is best judged based on the overall quality of the gun since we can very rarely identify the actual maker.
Price comparisons help also. Ferdinand Drissen was a Liege gun maker
http://www.littlegun.be/arme%20belge/artisans%20identifies%20d/a%20drissen%20gb.htm The conversion of Belgian francs to U.S. dollars in 1900 was about 5 francs to 1 dollar. The complete charge for the barrels and gunsmithing for '3 band Crolle' was 80 francs or about $16. Barrels 2-6 were each a Twist variant, and obviously much cheaper to produce

In 1900, Jean Lejeune of Nessonvaux listed the following prices for damascus barrels alone: 'Oxford'-16f, 'Boston'-10f ($2), and 'Birmingham'- 8f
In 1914, Arthur Delvaux-Heuve of Nessonvaux offered '3 Band Boston' and 'Star' for 14 francs.