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I honestly couldn't tell with my trust 20x loupe if this button were vegetable ivory or plastic! It's a fabulous fooler. I finally touched it to a red hot burner and it barely melted (see small groove on back). Also, the smell was not celluloid. It's a mystery to me, so I'm playing it safe and calling it a plastic. Even as plastic, this is a hand cut, pierced, and pressed button of acorns in the tree. It measures 1 & 3/16" in very fine condition with a steel shank. It would definitely be happy with other acorns :)
Button--Hand Pierced Vintage Plastic Acorns Really Imitate Vegetable Ivory