19 by 7 by 2 1/4 inches. Unmarked. Properly called a pitch mold. Pitch molds became popular during the late 19th and early 20th centuries.
A warm and soft mixture composed primarily of pine pitch was poured into a recess in a wood
block or frame. It was then turned over and squeezed down onto an oiled wooden pattern. They make a
great wall hanging or a backdrop for a shelf.