Miguel Covarrubias, Mexican, American, 1904 to 1957, pencil painting on laid paper depicting the sketch of a portrait. Signed with initials, lower right. Framed. Completed with an original letter verifying the authenticity of the sketch, signed by Anahi Luna, and dated January 2023. Provenance: Fondo Editorial de la Plastica Mexicana, Mexico City, with their ink stamp verso. Miguel Covarrubias, also known as José Miguel Covarrubias Duclaud was a Mexican painter, caricaturist, illustrator, ethnologist and art historian. Along with his American colleague Matthew W. Stirling, he was the co discoverer of the Olmec civilization. One of a kind artwork.