county clerk authentication for use in China:

County Clerk Certification/Authentication for Use in China

Step by Step Instructions , 06-23-2020

After a document has been notarized, some states will require certification of the notary seal by a County Clerk or official before submitting to the Secretary of State for state authentication. The certification will be processed by a County Clerk or Probate Judge. Please check with your state if this requirement exists. Sample: (click to enlarge):