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Does the social security bureau need to stamp the official seal when it receives the introduction letter of personnel file?

Need an official seal. Letter of introduction has legal effect. Letter of introduction is a letter of introduction issued by the unit for a person, which is a person's identity certificate or proof of engaging in a certain job and needs to be stamped with the official seal. Official seal refers to the seal made by government agencies, enterprises, institutions, social organizations and other units to prove the authenticity of their documents.