The mark consists of a three-dimensional configuration of the outwardly facing wall surfaces of the pressing plates of a juice press, the outwardly facing wall surfaces having three planar front wall surfaces bounded about the perimeter by four planar end wall surfaces. The three planar front wall surfaces lie in angular relationship to each other and are attached to a pair of spaced, horizontally extending axes defined by the upper and lower edges of the middle front wall surface. The broken lines in the drawing are not part of the mark but are merely intended to show the positioning of the mark.