Antique Bone Carved Jesus Skull Janus Head Momento Mori Rosary Bead

Sooooo rare & so awesome !!!! Authentic Hand carved I believe it to be some kind of bone Bead ONLY Nice shape for its age !!! Very Collectable Very old 1700-1800 era Came on a old nuns rosary I took off myself . Was stupid I know . But it’s the bead that’s most valuable . Please do your research on these.