7/8" with back paper by Phila. Badge which has small and minor moisture stain on upper left edge. Button names the licensed product and tiny text below Mickey's feet reads "Copy. 1928-1930/By W.E. Disney." This is the earliest version and a design we've seen only a couple of times in our 50 years. The typically seen version probably introduced about 1932 is a little smaller and depicts Mickey in red pants. Bottom curl has a faint near pinpoint tan dot beneath the letter "U" of "Undies" but essentially invisible when the button is viewed directly. NM.