Ala. Code § 4-3-16
All bonds shall be signed by the chairman or vice-chairman and the secretary or treasurer of the authority and the seal of the authority shall be affixed thereto; provided, that a facsimile of the signature of one, but not both, of the officers whose signatures will appear on the bonds may be imprinted or otherwise reproduced thereon in lieu of his manually signing the same; provided further, that a facsimile of the seal of the authority may be imprinted or otherwise reproduced on the bonds in lieu of being manually affixed thereto. Coupons shall be signed by the chairman or vice-chairman and the secretary or treasurer of the authority, but a facsimile of the signature of such chairman or vice-chairman and such secretary or treasurer may be impressed or otherwise reproduced on any such interest coupons in lieu of their manually signing the same. Delivery of bonds so executed shall be valid notwithstanding any changes in officers or in the seal of the authority after the signing and sealing of the bonds.
Ala. Code § 4-3-16 (1975)