Vintage Dark Abalone Shell Flat Four Hole Sewing Buttons

4 vintage dark colour abalone shell buttons flat 4 hole style made of a darker brownish, tanish, greenish abalone shell pretty reflect of pinks, ambers, greens and blues and a beautiful iridescence in excellent vintage condition ~ as these are a natural material, you will notice some imperfections and irregularities measures approx 1/2" diameter