El Tesoro. Western Livestock Journal. Sept. 1956

https://www.allbreedpedigree.com/el+tesoro2

from the AllBreed Site--

Br. by Merle Little.
Palomino, 14.2h, 1050 lbs. Foaled 5/23/1952, Duarte, CA. Registered progeny: 4 colts, 3 fillies. Western Livestock Journal Horse-of-the-Month September 1956.--