We know that the K is the stamp of Charles A. King but does the "f" indicate "fluid steel" or "field grade" or somehow "Vulcan"? It has been my understanding that the "f" was a stamp of inspection. Look in a search engine like Google for "f" and you will find descriptions "comparison" or "averaging". I just did a quick scan of TPS and found no reference to a "f" stamping. Maybe someone can direct me to the page on which such reference is found.
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