First, if a foreign unit needs to engrave the official seal, it must first go to the public security organ at or above the county level where the unit originated to apply for a letter of introduction or proof of engraving the seal, and then, with this letter of introduction or proof, go to the public security organ at the same level where the engraving factory or engraving shop is located to exchange for a letter of introduction of engraving the seal, and engrave it at the engraving factory or engraving shop designated by the public security organ.
Second, the financial seal, contract seal, special business seal, bank transfer seal and cash receipt and payment seal of state-owned and collective enterprise units shall be registered with the public security organ at or above the county level where the unit is located by the letter of introduction and business license issued by the unit, and after being audited by the public security organ, a notice of engraving or a letter of introduction shall be issued and engraved at the engraving factory or engraving shop designated by the public security organ.
3. The engraving of the above seal by a foreign-capital enterprise must rely on the business license and the registration certificate of the foreign-invested enterprise. If the enterprise is a Sino-foreign joint venture or Sino-foreign cooperative enterprise, it must hold a letter of introduction issued by the Chinese side, go to the public security organ at or above the county level where the unit is located to handle the notice or letter of introduction for engraving the seal, and then engrave it at the engraving factory or engraving shop designated by the public security organ with the notice or letter of introduction.
4. Engraving the official seals of the party and government, state-owned or collective enterprises, institutions and their internal organs, and going through the examination and approval formalities with the public security administration department of the public security organ at or above the county level where the unit is located by the certificate or letter from the superior leadership department or the department that approved the establishment. After examination and approval by the public security organ, the official seal shall be engraved at the engraving factory or engraving shop designated by the public security organ by issuing a notice of engraving or a letter of introduction and proof.