Legal analysis: The official seal and the company’s special contract seal are used for signing contracts. If it is used for other activities, the act of stamping the special contract seal is invalid. The quotation seal should be stamped by the enterprise. official seal. The company's official letters, documents, and reports to the outside world use the official seal. Documents stamped with the official seal have legal effect. If they are not stamped with the official seal, they will not have legal effect. A quotation in a uniform format with a company logo is an invitation to offer and does not have the legal effect of an offer.

Legal basis: Article 490 of the "People's Republic of China and Civil Code" Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it. Laws and administrative regulations stipulate or the parties agree that a contract should be concluded in written form. If the parties do not use written form but one party has performed its main obligations and the other party accepts it, the contract is established.

Article 493: If the parties conclude a contract in the form of a contract, the place where the last signature, seal or fingerprint is taken shall be the place where the contract is established, unless otherwise agreed by the parties.