The marks you mention would be various makers or inspectors marks. A common makers mark on barrel flats is WK which was for Walter King, who was a barrel contractor before becoming superintendent. At the time your barrels were mAde, I do not think King was working in the barrel department, so I doubt that the K has any connection to him.
To sum up, the HT over A or K are not very significant markings. Not like the weight stamps, the barrel steel marking, or frame size.
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B. Dudley
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