24L Teal Blue Four Hole Casein Buttons

Set of three. 1930s vintage teal blue casein buttons. Four-hole sew-through buttons in a square, rounded corner shape. Measure approximately 24L, 24 lignes, 15.2 mm, and 19/32. 

Invented in 1897, Casein milk plastics are a type of plastic made from a protein called casein found in milk. They were popular in the early 1900s, but making it was a slow process, and after World War II, newer plastics became more popular. The production of casein plastics all but ended after 1945.

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