The Book of Abraham contains three facsimilies. Translated by Joseph Smith from ancient papyrus, it contains the writings of Abraham while in Egypt. This sculpture is a relief carving, a typical Egyptian art style. In this scene Abraham sits upon Pharaoh's throne.
An explanation can be found below and on page 41 of the Pearl of Great Price.

HAND CAST IN THE USA
Material: Hydrostone, weight: 4lbs

Dimensions: 13” x 9” x 1”

Includes display easel