The legal effect of the contract has nothing to do with whether the contract seal is overweight or not. Although the contract seal is not numbered, as long as the contract seal is the legal seal of the unit, both parties to the contract have considerable capacity for civil conduct, the meaning is true, and the contract content conforms to the legal provisions, the signed contract is valid.

To sign a contract, you need to bring the following information:

1, materials that can prove the subject qualification of the parties, such as identity certificate, business license, identity certificate of legal representative, etc. ;

2. Other materials required for the contract, such as contract text, company seal, legal person seal, contract seal, signature pen, etc.

The process of signing a contract is generally as follows:

1. Signing Letter of Intent: After the two parties initially reach the intention of cooperation, they can sign a Letter of Intent to determine the basic framework and terms of cooperation as the basis for subsequent contracts;

2. Credit review: both parties need to review each other's credit and qualification to ensure the security and stability of the contract signing;

3. Negotiate contract terms: negotiate contract terms, including contract contents, performance methods, expenses, guarantees, liabilities for breach of contract, etc. It is necessary to fully communicate and negotiate to ensure that the two sides reach an understanding;

4. Sign a formal contract: after reaching an agreement on the terms of the contract, formally sign the contract. The contract needs to be signed and sealed by authorized representatives of both parties to ensure the validity of the contract;

5. Performance of the contract: Both parties shall perform the contract according to the terms of the contract and fulfill their respective obligations and responsibilities;

6. Contract modification: If the contract needs to be modified or modified, both parties need to re-negotiate and sign a written modification agreement;

7. Contract termination: When the contract expires or breaches the contract, both parties need to deal with it according to the terms of the contract to ensure the legality and effectiveness of the contract termination.

To sum up, the special seal for the contract has no number, and the unit only has one special seal for the contract, and no number is needed.

Legal basis:

Article 490 of the Civil Code of People's Republic of China (PRC)

If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.