I believe those barrels are from a Grade 2.
Grades 3 and higher would have the grade number stamped on the right side barrel flat toward the breech end. D = 3, C = 4, B = 5, A = 6, AA = 7, where Grade 2 and below did not get a grade stamp.
Usually, but not always, Grade 5 and higher would have the DD (finest Damascus) stamp where this one is stamped with a single D
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