I'm thinking it is becoming pretty safe to say that from the introduction of steel barrels in the latter 1890s to maybe sometime in the 1905 to 07 time frame K for Titanic Steel or a few Acme Steel and the Kf for Vulcan Steel barrels are the barrel steel markings.
And, the idea that the Kf was CAK's mark is debunked. If it was his mark, why would it only appear on Vulcan Steel barrels?
Quality VH 12-gauge serial number 95553 is presently being offered for sale on GI, but the seller doesn't include a picture of the barrel flats!!
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