https://trc-images.nl/collection_images/hires/2020/2020.2260a-b.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2020.2200\2020.2260a-b.JPG#
A pair of metal buttons with a design of curved lines around a central boss.There is a metal disc with a self-shank on the reverse of each button.