Set of 4 vintage gray marbled plastic sew-through buttons with a square shape and softly rounded corners. Estimate these to be from the 1930s-50s period. These thick, substantial buttons have a swirling pattern and a slightly concave face, adding a stylish mid-century touch to coats, jackets, or sewing projects.

Details:

• Material: Believed to be casein plastic
• Size: 1 1/8 inch (28mm) across, approx. 1/4 inch (6mm) thick
• Color: Gray with marbled pattern
• Shape: Square with rounded edges and concave face
• Back Type: Sew-through (4 holes)
• Era: Estimated 1930s-1950s
• Condition: Vintage with minor wear, no major damage

Identification:

• Sinks in water (dense, early plastic)
• Mild fluorescence under UV light
• Very mild chemical/sweet scent in hot water test (consistent with casein plastic)

(T-4)