I disagree. The early steel barrels have the K (Titanic & Acme) or Kf (Vulcan) stamp in the barrel steel location. I begin to see the V, P, P.S., T & A, usually in a circle in the 135xxx serial number range.
If the K and Kf were inspector's marks, why are they only seen on steel barrels? They aren't found on any Twist, Laminated or Damascus barrels.
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