https://trc-images.nl/collection_images/hires/2018/2018.1767a-b.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2018.1700\2018.1767a-b.JPG#
Moulded button in a blue and grey colour with a rim with a wave cross-section and a raised central section. It has two sewing holes