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 S&W 59/459/5904 series XP magazine springs 3 pak $34.97 LPA Smith & Wesson M&P Fibre Optic Adjustable Sight Set. $195.00