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Parker Bros. stamped most of the larger parts of a gun with the last three digits of the serial number so that anyone handling those parts would know they had been hand-fitted to a particular frame. Yours being 100645 the "645" is the three digit stamp you should see on most major parts.
The Kf is the stamp of Charles A. King, Superintendant of the Parker Gun Works up until 1910 when his son Walter King succeded him.
The Following User Says Thank You to Dean Romig For Your Post: