Bull leaping toward spade

"In 635 and 636, the principal figure is a bull.... In 636 the bull is leaping toward a spade, the symbol of Marduk, while other symbols are placed in the field. Neither the subject nor the execution is paralleled in other linear-style seals, and the date of 636 therefore remains undetermined. However, it should be noted that the bull's leap toward an object resemble the action portrayed in the Late Kassite seal 590, though the manner of the rendering in 636 is much more schematic."--Porada, CANES, p. 75