Lightweight

No markings

Art history:

It's meant to be eggshell. In the Victorian era, midwives often carried ceramic "birthing eggs" for the mother in labor to squeeze with her hands to relieve stress. The eggs often had a decorative feature of faux cracks in the egg with a baby's head popping through. The image was popular enough to become a decorative motif in its own right, appealing to Victorian sentimentality about childhood and motherhood.