Two bulls flanking tree

"The theme of animals flanking the sacred tree occurs in only a few linear-style seals (637, 638), though the motif is frequently found in the borders of robes on the reliefs of Ashurnasirpal II. A ninth-century dating for 637 and 638 is indicated by the correspondence with these reliefs and confirmed by the rendering of the tree in both seals, since it resembles the treatment in such ninth- or eighth-century cylinders as Berlin 673-675."--Porada, CANES, p. 75