Here is my 18-3 with 3 T's. After doing some research I feel that the TT and TH are fairly common on these guns. I don't have the box so I can't honestly say they are original. To be honest I don't care that much. The gun is a beauty and I love to shoot it. Like all Smith's if you take care of them they will appreciate over time.
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That certainly looks like -3 era stocks. S&W must have procured some really nice GA wood at that time. One of the interesting things about my letter is Roy specified walnut target stocks which they are. The 18-2 is a fine shooter as well but I normally take out a shooter grade pre-17 to the woods. All hail the S&W .22 revolvers.