A big and heavy seal in rich spinach-green nephrite jade,
accurate copy of a Qianlong Imperial seal, surmounted by crouching
Double Dragon pierced at mouths and center, 4-character Yang
style Qianlong seal on bottom.
A side view here.
Provenance: a good East Coast collection. The Han dynasty
imposed strict regulations on seals. According to the Hanguan
Yi (Rites of Han Officials) the Double Dragon knop was
reserved for the exclusive use of Emperors and Empresses.