This rather small fireplace insert has a stamp on the back: Braxton Payne All Rights Reserved. It is formed "ceramic" with brick look inside with different colors to show the soot. The base is a rather flat piece of vinyl brick sheeting. It measures 4-3/4" across, 1-1/8" deep without the base, 1-7/8" deep base, and stands just over 3" high.
See additional photo for side view.