7/8" with backpaper by W&H used for only three years. Reverse has trivial .25" hairline cello split next to the collet but cello lays perfect. Front has depiction of guitar and mandolin with surrounding text "Wolfram Triumph Guitar & Mandolin Co. Columbus, O." This company was founded in Columbus in 1891 and introduced the aluminum fretboard. By Feb. 1901, a few years after this button was issued, they had made their 10,000 guitar although the company ended in 1910. Button displays Mint. Rare. Morry Greener Collection.