Amazon.com: Button Metal Skull with Shank 12mm (1/2") Antique Silver by 2pcs, TR-11145B
Vintage Buttons Skull Metal Buttons Silver Vintage Metal Sewing Buttons | eBay
Amazon.com: Mingchen Metal Skull Buttons for Blazer Sweaters Men and Women (Black/Antique Silver Mixed Colour 20 Pieces Per Set) Two Sizes 0.98/0.59 Inches (0.98 inches)