Taking into consideration the provisions of section 11.5 of this charter, which require an election and disclosure of the current assessed valuation and outstanding general obligation bonded indebtedness of the town prior to the issuance of general obligation bonds, there shall be no limitation on the amount of bonds or other securities the town may issue except as may be stated in the documents pertaining thereto. All bonds or other securities issued pursuant to the provisions of this charter shall be sold at public or private sale to the best advantage of the town at, above or below par. Bonds may contain provisions for redemption prior to maturity with or without the payment of a premium. The maximum premium payable on prior redemption of any general obligation bonds may, but need not, be specified in the bond question approved by the qualified electors.