The guarantee issued by the unit needs to be stamped, and it is best to have the signature of the leader. A letter of guarantee is actually a contract with legal effect. However, a valid letter of guarantee must meet the following three conditions at the same time: 1, which reflects the true wishes of the parties. The content of the letter of guarantee shall be the expression of the true meaning of the parties, and shall not be forced, threatened, lured or deceived. 2. No violation of relevant laws and regulations; The contents of the letter of guarantee must comply with the provisions of the law and cannot violate the prohibitive provisions of laws or administrative regulations, otherwise the letter of guarantee may be invalid. 3. Do not infringe upon the interests of others. The guarantor can only dispose of what he has the right to dispose of, but not infringe upon the legitimate interests of others.
legal ground
Article 16 of People's Republic of China (PRC) Labor Contract Law (revised 20 12) came into effect. The labor contract shall come into effect after the employer and the employee reach an agreement through consultation and are signed or sealed by the employer and the employee. The text of the labor contract is held by the employer and the employee respectively.
Article 115 of the Interpretation of the Civil Procedure Law of People's Republic of China (PRC), the certification materials submitted by the unit to the people's court shall be signed or sealed by the person in charge of the unit and the person who made the certification materials, and stamped with the seal of the unit.