S.C. Code Ann. § 11-51-140: Executive signature, attestation, and state seal requirements.

General obligation debt issued pursuant to this chapter must be signed by the Governor and the State Treasurer and attested by the Secretary of State. The Governor, State Treasurer, and Secretary of State may sign the general obligation debt by a facsimile of their signatures. The Great Seal of the State must be affixed to, impressed on, or reproduced upon the general obligation debt. The delivery of the general obligation debt executed and authenticated, as provided in the state board resolution, is valid notwithstanding changes in officers or seal occurring after the execution or authentication.