Japan

Imperial seal (Kikumon)
No official description has been found yet.

Government seal (Kirimon)
No official description has been found yet.

Privy seal (Gyoji)
The seal is affixed to documents such as Imperial rescripts, proclamation sentences of laws, cabinet orders, treaties, instruments of ratification, ambassadors' credentials and their dismissal documents, documents of general power of attorney, consular commissions, letters authorizing foreign consuls, letters of appointment or dismissal of government officials whose appointment requires the Emperor's attestation, and letters of appointment of officials of the fourth court rank and upwards. It has “Tenno Gyoji” carved on it.

Source: The Privy Seal and State Seal, Imperial Household Agency

State seal (Kokuji)
The State Seal is used only for certificate decoration (Kunki), and it has “Dai Nippon Kokuji” carved on it.

Source: The Privy Seal and State Seal, Imperial Household Agency