I looked at an early '06 Navy with the extra cut, and a 1917 that does not have the cut. There is a noticeable difference in the depth the V cut when comparing the pistols side by side. With just a small machinists square for a scale, the difference appears to be around 1/32 deeper on the sight with the extra cut. I have never read if the sights were actually regulated, or if this is just within manufacturing tolerances.
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