Robert: On p. 379 of L.C. Smith "The Legend Lives", the damascus barrels as graded by Hunter Arms are described as follows: English Stub Twist- F grade hammer guns and pre-1892 No. 1 hammerless, Good Two Rod Damascus- E grade hammer guns, pre-1892 No. 2, and post-1892 No. 0, 1, & 2, Good Four Stripe Chain Damascus- post-1892 No. 2, 3, 4, & A1 , Fine Three Rod Damascus- C & D hammer guns, pre-1892 No. 3, and post-1892 No. 3, Pigeon, No. 4 & A1, Very Fine Three Rod Damascus- B & A hammer guns, Pre-1892 No. 4 & 5, and post-1892 No. 5, Finest Three Rod Damascus- AA hammer gun, pre-1892 No. 6, and post-1892 A2 & Monogram, Choice Three Rod Herring Bone Pattern- Syracuse Quality No. 7 and post-1892 A2. Hunter Arms used "Laminated Steel" on Quality No. 1 guns 1892-1898. Two Iron "Good Damascus" was used until 1907, when "Special Steel" by Halcomb Steel Co. was introduced. The A3 was introduced in 1895 with Whitworth or Krupp steel.