S.C. Code § 44-7-980
Such bonds shall mature serially over a period not exceeding thirty years from the date of their issue, shall bear interest at a rate not exceeding four per cent per annum, payable annually, shall be payable to bearer within or without the State and shall be in such form and denominations as the city council of such municipality may determine. The said bonds shall be signed by the mayor and the treasurer, and the seal of the issuing municipality shall be impressed thereon, but the coupons attached may be authenticated by only the lithographed or the facsimile signatures of the mayor and treasurer of such municipality. The bonds so executed shall be valid notwithstanding any change in officials occurring before delivery thereof.
S.C. Code § 44-7-980