Smith & Wesson N frame thumb piece early style, blue $35.00 Part 21 on the exploded diagram. Used, excellent condition blue thumb piece, early style, from a Model 57, N frame revolver. Will fit other models of N frame revolvers. In stock Smith & Wesson N frame thumb piece early style, blue quantity Add to cart Category: Smith & Wesson Related products Smith & Wesson K frame .38/.357 Extractor Rod, long $20.00 Smith & Wesson K frame thumb piece early style, blue $35.00