This is the first official design issued upon their arrival in America. All carry the credit line “©Nems Ent. Ltd. 64.” First is 1-3/8” litho which is quite a rarity and unusual in that litho buttons are usually reserved for large quantity runs. That is not the case here and this is only the second or third we’ve ever seen of this size made by Green Duck. Next is 3.5” with a brass colored metal back. Third item looks the same as the second but has silvered metal back. Both of these are celluloid with light general wear showing in reflected light but no stain. Fourth item is the one most seen, a 4” litho. This one is exceptionally nice and about 99% Mint.