"Negrito Colmilludo" (tusked little black one) mask.  
Artist Unknown.  Probably Coastal Mixtec, Guerrero or Oaxaca, Mexico, mid-20th century.
Carved wood w/ oil paint.
(7 1/2" h. x 7” w. x 4” d.)
Tag on back says "Zorroros"

Ex. collection of Jonathan Fisher