Legal analysis: the unrecorded official seal has legal effect.

Enterprises in the signing of the contract, as long as it does not violate the relevant provisions of the law, does not violate the relevant provisions of other prohibitive laws and regulations, is the expression of the true meaning of the two sides, are valid contracts.

Legal basis: "the Chinese people's *** and national code" Article 490 of the parties to the contract in the form of a contract, since the parties are signed, sealed or fingerprinted when the contract is established. The contract is formed when one of the parties has fulfilled the main obligation and the other party has accepted it before the signatures, seals or fingerprints are affixed.

Laws, administrative regulations or the parties agreed that the contract should be in writing, the parties did not use the written form, but one party has fulfilled the main obligations, the other party accepts, the contract is established.