The mark consists of a front view of the shape of a stylized horned ox head, the word "BLUE" appearing in block lettering above the head between the horns, the unshaded word "OX" appearing in block lettering across the face of the ox head, the unshaded letter "O" having its center shaded forming an open right eye with shaded pupil, the unshaded letter "X" forming a closed or winking left eye, a pattern of four progressively wider concentric rings are centered about the pupil forming a target pattern having the pupil as its midpoint, the first concentric ring being formed by the unshaded letter "O", the second concentric ring being a very light shade, the third concentric ring being a light shade, the fourth concentric ring being a dark shade, the upper portions of the third and fourth concentric rings appearing in the letters "B", L" and "U", the remainder of the design outside of the fourth concentric ring being a very dark shade, the shading being provided to show contrast.