(1) Revenue bonds may be sold for such price including sale at a discount and in such manner as the municipality may determine by ordinance.
(2) The bonds shall be executed by the manual or facsimile signature of the mayor and the manual signature of the clerk or recorder of the municipality.
(3) The coupons attached to the bonds may be executed by the facsimile signature of the mayor of the municipality.
(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.