If it is only valid from the perspective of signature, because the front part has the same legal effect as the seal and seal, but it also depends on whether it is the appraisal opinion made by the unit. If it is in the name of the unit It must be stamped, and if it is in your name, just sign.

Legal basis:

Article 469 of the "People's Republic of China and Civil Code" The parties may conclude a contract in written form, oral form or other forms.

Written form is a contract, letter, telegram, telex, fax, etc. that can tangibly express the content contained therein.

Data messages that can tangibly express the content through electronic data exchange, email, etc., and can be retrieved at any time, are deemed to be in written form