(1) The bonds shall be executed by the mayor and the city clerk or recorder of the municipality, or by the county judge and the county clerk of the county, as the case may be.
(2) One (1) signature may be facsimile, but one (1) signature must be manual.
(3) The coupons attached to the bonds may be executed by the facsimile signature of the mayor or county judge.
(4) In case any of the officers whose signatures appear on the bonds or coupons shall cease to be such officers before the delivery of the bonds or coupons, their signatures shall nevertheless be valid and sufficient for all purposes.