A JADE 'TORTOISE' UNCUT SEAL AND THREE ROCK CRYSTAL SEALS The jade seal Ming Dynasty or earlier The jade seal of mottled green hue and on square base, the crystal seals comprising: a rectangular-section example seal face in zhaunshu script and also bearing family inscription Tie Zhi; a square-section example seal face in zhaunshu script and also bearing family inscription Da Chuan; and an uncut example of oval-section with suspension ring. The tallest: 4.8cm (1 7/8in) high (4). 注脚 Provenance: The jade seal with Du Boulay Collection label numbered P230.