Green Tagua Corozo Button Five Squares Flat Pillow, 9/16" or 11/16"
Square button with four square holes. It's almost 1/8" thick but then slightly raised - 'pillowed' in the center, so it's not quite flat anymore. Jade-Olive Green
$1.75 small 9/16"
$2.25 large 11/16"
Vegetable Ivory/Tagua/Corozo: Click here or here for wikipedia articles about this tropical palm tree nut. Tagua has been used for buttons since the 1880's, before plastic.