Vintage Czech glass buttons Lot (3) 18mm Deco geometric ribbed silvered blue arc

Lot (3) Bohemian Czech Vintage hand molded geometric arc rectangle ribbed blue glass buttons with silvered finish. Premium quality vintage Czech glass buttons, demonstrating the skills of early C20th glass button makers. These are vintage and were hand molded and finished; therefore they will have slight nicks.
For jewelry making, fashion design, sewing and crafting.

Size: 18mm; 11/16" 
Material: Vintage glass. 
Shank: self shank
Origin: N. Bohemia / Czech
Year: Vintage cca. 1930's 
Condition: Original authentic condition. 
Quantity: 3