First, the official seal of the internal department of the unit, because the internal department is not an independent legal person, does not have legal personality, obviously can not sign documents with the same legal effect.
Second, the company's department seal usually has certain legal effect. However, the official seal must be able to specifically represent the company and be used within the corresponding scope.
If the official seal does not specifically represent the company name, or if the official seal is beyond the scope of application, the contract concluded shall be deemed invalid. Company seals mainly include official seal, corporate seal, financial seal, contract seal, invoice seal and department seal. Whether the company's department seal has legal effect mainly depends on its scope of application, and it is invalid beyond the scope of use. _( 1) official seal is the most effective of all seals, and any letter, official document, contract, certificate or other materials issued in the name of the company can be used.
_(2) The corporate seal is the abbreviation of the legal representative's seal, which is equivalent to the legal representative's signature. Usually, it is only used for limited purposes. If it is stipulated in the contract that the contract will take effect when the special seal for the contract and the legal person seal are stamped at the same time, this chapter is needed.
_(3) Special financial seal is used for company accounting and bank settlement.
_(4) The special seal for contracts is used by the company when signing contracts with foreign countries.
_(5) The company shall use the special invoice seal when issuing invoices.
_(6) The department seal is limited to the internal use of the company, and it is invalid for external use.
Legal basis:
Article 143 of the General Principles of the Civil Law of People's Republic of China (PRC) A civil juristic act that meets the following conditions is valid:
(1) The actor has corresponding capacity for civil conduct; (2) the meaning is true;
(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs. Article 490 Where the parties conclude a contract in the form of a contract, the contract is formed when the parties sign, seal or fingerprint it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.