S.C. Code Ann. § 26-1-60: Seal of office; notary shall indicate date of expiration of commission.

A notary public shall have a seal of office, which must be affixed to his notarial acts. He shall indicate below his signature the date of expiration of his commission. The absence of the seal of office or date of expiration does not render his notarial acts invalid if his official title is affixed to it.