https://trc-images.nl/collection_images/hires/2018/2018.1452a-b.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2018.1400\2018.1452a-b.JPG#
Pair of round blue plastic buttons. Different effects created by using concave and convex shaping with four sew through buttons.