Inscriptions used by previous dynasties were at times also re-used when producing new imperial seals. For example, an imperial seal with the inscription "Sắc mệnh chi bảo" (敕命之寶) was first created at the time of the Mongol invasions of Đại Việt and Champa during the reign of Trần Thái Tông of the Trần dynasty and was used to stamp documents ordering or declaring royal (or imperial) ordinances during the early days of the war. The Trần dynasty period "Sắc mệnh chi bảo" seal was made of wood, but later versions of the "Sắc mệnh chi bảo" were primarily made of silver and gold. Precious metal "Sắc mệnh chi bảo" seals were made during Later Lê, Mạc, Revival Lê, and Tây Sơn dynasties. Under Minh Mạng a "Sắc mệnh chi bảo" seal was made for the Nguyễn dynasty, this seal was used on imperial ordinances until 1945. Furthermore, the seals of the Nguyễn lords such as the "Thủ tín thiên hạ văn vũ quyền hành" (取信天下文武權行, "Win the trust of all under heaven, seal for military texts.") also remained in common use until the year Minh Mạng 9.