Late 19th-early 20th century AD. A finely made spherical sensor, hinged with hook-and-eye fastener and suspension chain with hook, the outer shell heavily pierced and engraved depicting birds, flowers, symbols and scrolls; internally fitted with triple ring gimbal and small hemispherical dish for incense. 72 grams, 15.5cm (6"). From the family collection of a Hampstead gentleman; formerly acquired in the 1980s.