The photo has been kindly provided by Juan de la Torre and Teresa Soria
( EGIPTOMANIA.COM )

Bibliography
W.M.F. Petrie, Naqada and Ballas, 1895, pl. 47, 1
W.M.F. Petrie, Predynastic Egypt Corpus, 1921, (pl. 52) type 2 (Petrie, Prehistoric Egypt, 37, adfirms that this palette represents a 'barbary sheep')
R. Weill, Recherches, 1961, pt. II, p. 249
E. Baumgartel, Petrie's Naqada excavations. A supplement, 1970, pl. 49 (tomb 1562)
Aldred, Debono, De Cenival et al., Le Temps des Pyramides, 1978, fig. 55
J. Crowfoot-Payne, Catalogue of the Predynastic Egyptian Collection in the Ashmolean Museum, 1993, p. 222 (cat. n. 1806)
K. Cialowicz, Les Palettes Egyptiennes aux motifs zoomorphes et sans décoration, 1991, 38, fig. 9

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