Mid 20th century press moulded black glass buttons from Czechoslovakia. Two hole sew through style, with a slight concave centre and a lightly faceted edge. The storage of these items has not been optimum, and while they are unused, there is minor wear on the gold gilding around the edge on some. Simple, elegant.
 
Glass buttons should be removed before dry cleaning.
Gentle hand wash instead.
 
23mm diameter.