Why do some seals have a string of numbers under them and some don't?

A new type of digital anti-counterfeiting seal (metal surface, built-in electronic chip). What has no numbers is the old-fashioned seal (red glue seal).

At present, the official seals of most areas have been added with pseudo-codes, which are controlled by the whole country and are not the characteristics of any unit.

Steel seal, the new anti-counterfeiting seal, needs to be engraved with a name and a long string of numbers, while red seal, the old seal, only needs the company name.

The new anti-counterfeiting seal basically does not change the graphic mode of the official seal, but engraves the address, telephone number, industrial and commercial bureau of the place of registration and even the code of the seal owner on a stamp circle with a width of less than 2mm, and makes it present an inseparable visual text together with the seal for the recipient to check the authenticity face to face by telephone or online inquiry system.

Extended data:

Seal card and computer management

After the seal is made, it is equipped with a certificate card to store all the graphic information of the seal, such as the name of the official seal, the examining and approving unit, the name of the legal person, the address of the unit, telephone number, fax number, seal number and automatic password matching.

When using securities stamped with the official seal, you must use a card that matches the official seal (the "ID card" of the official seal), and enter the password for the financial department to check with the computer before conducting business activities. The seal can also be stored in the computer seal database of relevant business departments without a card, and can be networked in local or national areas.

The computer automatic seal recognition system and corresponding software have been developed by many companies and put into the market. Yunnan Seal Company has launched a seal anti-counterfeiting network management system, which is managed by computer from seal approval to production, identification and inquiry. If the network is built, it can be used for local or remote telephone voice inquiry and receiving loss reporting.

References:

Counterfeiting-Baidu Encyclopedia