Any excess, or used or worn out flagging, bricks, stone, lumber, piping, machinery or other materials or supplies belonging to the City, and not, in the opinion of the Board of Commissioners, necessary or required for any useful purpose by this City, may be sold and disposed of at any time by order of the Board of Commissioners.
Sales of any part or portion of such material having in the opinion of the Board a value less than $1,000 may be made at private sale, by the proper director, on order of the Board of Commissioners; and if any such part or portion of such material has a value in excess of $1,000 in the opinion of the Board, then the same shall be sold at public vendue, or by means of sealed bids, after advertisement in like manner as proposals for supplies are published.