In a private collection of ancient objects in Hanoi, there is an ivory seal inscribed with 9 Chinese characters " Dai Nam Thu Thien Vinh Menh Truyen Quoc Ty'. Though the study on the material, measurement from, decorative designs, Chinese Character style, which have been compared with some other valuable seals from the Nguyen period, which are being kept in the National Museum of History, the author supposes that the seal in the above - mentioned collection is faked, with the copied content from ajade seal of Thieu Tri time.