The spring tension screw in the grip frame, a 6th screw, is not counted for description or identification in conjunction with the "screw count" criterion for K and N frames. The reason is that it never changed and was not relevant to the 5 screw count context as opposed to the other side plate screws included in the count even though they didn't change.

However is counted in the 6 screw count of the I frames because it was eliminated in ~early 1952 and separates the Post War Transitional I Frame Models from the 5 screw Improved I frame Models.

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Jim
S&WCA #819