In terms of effectiveness, the company seal is greater than the company contract seal and the department seal. So it is no problem for you to use the company seal on the department documents.

Generally, when a signed document is stamped with the official seal of the company, it is not necessary to sign the company name. Only very important documents need to sign the company's name.

Formal official documents are needed. Some red-headed documents are less than 20 copies. Write down the company name, no need to stamp the official seal. According to the new official document regulations, the signing office can now use Arabic numerals instead of the full name of the company.

Extended data:

Formal official documents are needed. Some red-headed documents are less than 20 copies. Write down the company name, no need to stamp the official seal. According to the new official document regulations, the signing office can now use Arabic numerals instead of the full name of the company.

References:

Baidu Encyclopedia-Official Seal