No, in the same dynasty or even the same emperor, there is more than one jade seal.
Generally speaking, the jade seal is used by the emperor to affix national memorials or imperial edicts. Such jade seals are usually only one in the same dynasty, and even the jade seals passed down to the country have been passed down for several generations.
But in fact, there is more than just this one jade seal. In addition to the jade seal on the official document, there are also several jade seals. The jade seal referred to here is actually the seal used by the emperor, similar to the private seals used by people today. , some were stamped on different documents, some were used by the emperor himself to collect books or calligraphy and paintings, and some were used by the emperor to prove his identity. Such seals can also play the role of jade seals in many cases, especially in some similar This type of jade seal is often used in secret edicts and other links. Therefore, this type of jade seal is generally called a private seal, while the jade seal just mentioned is called a national seal. The private seal only represents the individual who uses the seal. For example, the empress's decree and the queen mother's decree that are often seen on TV are the private seals of the queen and the queen mother. However, due to the supremacy of the ancient emperor, the emperor's private seal basically has etc. for the effectiveness of the national seal.
Of course, this type of private seal is only valid when the emperor himself is the emperor. Unlike the national seal, which is valid for the entire dynasty, private seals are generally rarely used for major events that formally involve the entire country. Such as transfers, wars, etc. Therefore, although there is more than one jade seal, the most important one is the national seal.