(1)    Municipal obligations shall be executed in the name of and for the municipality issuing them by their qualified officers who shall, for that purpose, sign the same in their official capacities, as follows: for a county, the chairperson of the county board and the county clerk; for a city, the mayor or the city manager and the city clerk; for a village, the president and the village clerk; for a town, the chairperson and the town clerk; for a technical college district, the chairperson and secretary; for a metropolitan sewerage district established under ss. 200.21 to 200.65, the chairperson and secretary; for any other municipality, the president and clerk or secretary of the governing body. The facsimile signature of any of the officers executing a municipal obligation may be imprinted on the municipal obligation in lieu of the manual signature of the officer but, unless a municipality has contracted with a fiscal agent under s. 67.10 (2) to authenticate the municipal obligation, at least one of the signatures appearing on each municipal obligation shall be a manual signature. Municipal obligations bearing the signatures of officers in office on the date of the execution of the municipal obligations remain valid and binding even if before the delivery of the municipal obligations any or all of the persons whose signatures appear on the municipal obligations have ceased to be officers of the municipality issuing them. Each municipal obligation issued by a municipality having an official or corporate seal shall be sealed with such seal or a printed facsimile of such seal.

   (2)   The sale of bonds shall be public and noticed as provided by resolution, except that refunding bonds and bonds issued by a municipality and to be purchased by itself for any of the debt service accounts for any of its bond issues or any trust or reserve fund of the municipality may be sold at public or private sale. Bonds may be sold at such price or prices as shall be determined by the municipality.

   (3)   Any or all bids received may be rejected and the sale canceled, or the sale of all or any part of the bonds negotiated, after bids at public sale have been rejected or if no bids are received.

   (5)   Such negotiation and sale, or other disposition, may be effected by a disposition from time to time of portions only of the entire issue when the purpose for which the bonds have been authorized does not require an immediate realization upon all of them.