Smallest is .75" and largest are 1.25". There are two duplicate Robins among the twelve Audubon button. Most of these are 1930s and earlier with the last two being litho and c.1950s. The five larger have W&H back papers (except one) and as these were used as a premium the curl reads "Long Chew Gum." The first two are Exc. but the final three have multiple craze lines although they display cleanly. The Audubon buttons are NM to Mint with the exception of the Cardinal which has wear but displays well.