Gilded Silver Flat Flask with Dragon and Phoenix Patterns, height 40cm, length 30.5cm, thickness 11cm, weight 2447g. Imperial wine vessel of the Tang or Liao dynasty for noble banquets, symbolizing imperial power and auspice. Body of silver with partial gilding, thick texture, brilliant gilding and silvery-gray patina on the oxidized silver body. Made with hammering, gilding and engraving techniques; the flask is square-flat with chi dragon ears on the shoulders, the belly engraved with double dragon and phoenix patterns and cloud patterns. Vigorous dragons and vivid phoenixes form a sharp contrast between gilded patterns and silver background, representing the peak of Tang/Liao gold and silver ware craftsmanship. Tang or Liao Dynasty. This flat flask is a core artifact for studying ancient gold and silver craftsmanship, wine vessel culture and court etiquette, witnessing the heyday of Tang/Liao handicrafts with exceptional historical and artistic value.