This dramatic mid 20th century Mexican ceramic mask (or possibly a wall plaque) from Oaxaca, represents a 'calaca' -- a skull, used in ceremonial drama dances usually during Day of the Dead festivities. The mask is made from low fired terra-cotta and heavily glazed in brown and black over a creamy white slip.
This mask is published in 'Saints and Sinners,' page 124. See scan above.
Dimensions: approximately 7.75 inches x 5.5 inches.