Lot (17) antique Czech 2 part metal mounted geometric white glass cabochon buttons

Lot (17) antique Czech 2 part metal mounted glass cabochon buttons. With tin and brass metal mounts and inset geometric white glass cabochons. The metal mounts on these buttons were plated and this inevitably wears off or oxidises with age. All have signs of this wear and engrained dirt.
Origin: Northern Bohemia circa 1900's
Size: 15mm; 9/16" approx 
Material: Glass. Metal
Shank: Metal loop