Ancient Coin with Harappan and Egyptian Symbols on Parchment Texture

Design a round, ancient-looking coin or seal, placed centrally on a parchment-textured background. The coin is divided vertically into two halves, symbolizing two great ancient civilizations: On the left half, depict a Harappan seal: a detailed unicorn motif engraved in reddish-brown stone, with Indus Valley script inscribed above or around it. On the right half, feature Egyptian symbols: a golden Eye of Horus or Ankh, with faint Egyptian hieroglyphs etched beside or behind it. The division should be seamless but clear—like two styles merged into one unified artifact. The surface of the coin should appear aged, worn, and textured, as if discovered by archaeologists. Use earthy, warm tones like terracotta, sandstone, bronze, and faded gold. Add subtle shadows and lighting to give it a 3D embossed effect, like an ancient relic displayed in a museum. In the background, softly overlay faint scripts from both civilizations—Indus script on the left and Egyptian hieroglyphs on the right—fading into the parchment texture.