A gilt copper alloy repoussé ritual conch trumpet. Tibet, circa 18th century. Photo Bonhams

Conch shell with gilt and stones; the gilt copper alloy apron extending from the lip natural shell is worked with the eight auspicious symbols, scrolling floral and mountain forms. 8 in. (20.3 cm.) - Estimate: US$5,000 - 8,000

Provenance: Aquired form Dragon House, San Francisco, 2005

Bonhams. The Sartin Collection of Asian Art, 13 Sep 2011, New York www.bonhams.com