The mark consists of a substantially irregular shape showing a wavy external perimeter; there is a Greek key next to said external perimeter consisting of zigzag linings repeated along the whole perimeter without touching it; there are three holes inside bounded by linings forming a framing whose inner parts are substantially squared whilst the outer one is rectangular; among the holes there are oval fields formed by further linings connected with the ones which compose the above framing; the whole being in gold color.