Bidspirit auction | Japanese genuine antique Samurai button

Japanese genuine antique Samurai button + wooden nail, circa 1650 AD - Japanese genuine antique Samurai button + wooden nail, circa 1650 AD Origin: from the genuine wooden box of the iron Samurai armor; Material: Bone? Shell? Size: 18 mm; Weight: 0.21 g. The last 2 photos - microscopy x 50.