Openwork Lion-Knob Square Seal, of iron base with gilding and gold outlining techniques, the seal knob three-dimensionally round carved with a male lion in powerful vivid expression, the four sides of the square seal body carved with interlocking dragon patterns using multi-layer openwork piercing technique, with intricate exquisite patterns, the seal face engraved with various characters, the border decorated with scrolling grass patterns, overall height 11cm, length 10cm, width 10cm. Integrating metal casting and openwork carving craftsmanship with solemn form, it is a high-grade ancient official standard seal, combining craft value and historical research significance.