Plaque from a Casket with a bird, 4th?5th century, Made in Byzantine Egypt, Coptic, Bone with polychromy, Overall: 2 7/8 x 2 x 1/8 in. (7.3 x 5.1 x 0.3 cm), Ivories-Bone, Bone plaques were used to decorate couches, chests, and other furniture. Some w