hi,am trying to understand what does the official stamp named above stand for?

Question

If a chinese citizens write me an invitation letter with all the information as above...., does the letter needs to be stamp at the immigration or elsewhere in china?

Isabel · Answer

The official stamp named above stands for the stamp on the invitation letter of a duly authorized unit.If a Chinese citizen writes a personal invitation letter to you, it doesn’t need to be stamped by the immigration or other department.

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Hi,am trying to understand what does the official stamp named above stand for?