1.75" without backpaper but with name of maker W&H on the curl. Metal back has surface oxidation and two spots of oxidation on the collet but none of this causes a problem as the celluloid remains extremely clean with just the most minor couple of pinpoint gray dots scattered around the extreme outer edge. The dealer's name is "Kircher & Son" and they were located in "Belleville, Ills." Their diamond shaped logo is printed at the button's center with wording below "Evidence Of Quality." Early 1900s and rare.