Actually, on grades 3 and up the grade numeral was stamped on the right barrel flat nearest the breech end. On D-Grade and higher you will see a stamp of 3, 4, 5, 6, 7, 8, 9 representing the letter grades of D, C, B, A, AA, A1S, Invincible.... again, depending on the grade. Grade 2 and lower were not stamped.
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