A guy has this old M&P Model of 1905 (Fourth Change) for sale. The serial number dates the gun to roughly 1927. The stocks are obviously much later, post-WW 2. What caught my eye is the oddball front sight. This revolver should have the standard "round blade front sight," or what I call the "half-moon sight." I showed the photos to one expert, who said to him it looked like "a cut-down, altered front sight." Well, okay, but how was that accomplished? I have a couple of Fourth Change revolvers from the same general era, and the front sight blades are much thinner than the blade on this sight. Can anybody shed some light on how this sight came about?
For comparison, here is the front sight on a 1919 M&P Model 1905 (Fourth Change):
More photos of the mystery sight:


For comparison, here is the front sight on a 1919 M&P Model 1905 (Fourth Change):

More photos of the mystery sight:



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