Stephen, The HT/A is believed to stand for "Heat Treated/Annealed" Also the "K" is an inspectors mark that I have seen before. This is only conjecture on my part but my thought is this is King's mark. Parker Bros. superintendant. Parker Bros. used many employees as vendors and once they completed work on a gun it was in many cases's stamped with their mank. Hope this helps....
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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