A fine Tibetan or Mongolian 19th century silver and metal Phurba (ritual dagger), the hilt decorated with four Vajrakila wrathful bone masks each embellished with turquoise, the handle inlaid with turquoise, coral and a lapis lazuli. The tapering triangulated iron blade issues from the mouth of a mythical makara further inlaid in turquoise, coral and lapis lazuli, 25 cm length, Provenance: Geoffrey key collection, London