Tianji Wenbao incised four-character mark, 18th century The domed weight finely carved as a mythical bird with a single crest and pointed beak, on a circular base with its wings outstretched as if ready for flight, the slightly-flared wings flanking a bulbous body, the long tail feathers elegantly curled in various directions, all meticulously incised with well-defined feathers suggesting vivid movement, the base incised with a four-character 'Tianji Wenbao' mark within a dense ground of C-scrolls, the smoothly-polished stone of pale-green tone with beige and russet inclusions. 6.1cm (2 3/8in) diam.