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It has five screws, as opposed to three. The side plate of older S&W revolvers had four screws holding it to the frame, and there was a fifth frame screw that was also eliminated to create a total of three frame screws. S&W has reintroduced the fourth sideplate screw on some modern models, so we now have "four screw" guns, in addition to the earlier 3- and 5-screw. My circa 1915 N-frame has five screws, my '86 had three, and my '08 has four.
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