Ala. Code § 41-10-57
The bonds shall be signed by the president of the authority and attested by its secretary, and all interest coupons applicable to the bonds shall be signed by the president of the authority; provided, that a facsimile of the signature of one, but not of both, of said officers may be printed or otherwise reproduced on any of the bonds in lieu of their being manually signed, and a facsimile of the president's signature may be printed or otherwise reproduced on any of the interest coupons in lieu of their being manually signed. The seal of the authority shall be impressed on the bonds; provided, that a facsimile of said seal may be printed or otherwise reproduced on any of the bonds in lieu of being manually impressed thereon. If any officer duly authorized thereunto, after signing any of such bonds or the interest coupons thereunto appertaining, manually or by facsimile, shall for any reason vacate said office, the said bonds and interest coupons may nevertheless be delivered at any time thereafter as the act and deed of the authority.
Ala. Code § 41-10-57 (1975)