(a) Bonds shall be executed by the manual or facsimile signature of the mayor of the municipality and by the manual signature of the clerk or recorder of the municipality.
(b) Coupons attached to the bonds shall be executed by the facsimile signature of the mayor.
(c) In case any of the officers whose signatures appear on the bonds or coupons shall cease to be such officer before the delivery of the bonds or coupons, their signatures shall nevertheless be valid and sufficient for all purposes.
(d) The bonds shall be sealed with the seal of the municipality issuing the bonds.