Notwithstanding the provisions of Sections 47902 and 47903, any district organized pursuant to this division, which organization was completed prior to the effective date of this section, may, prior to July 1, 1963, adopt the resolution and file a certified copy thereof with the auditor, assessor, tax collector and treasurer of each county within which the district is situated, which resolution shall be effective on filing notwithstanding the provisions of Section 47903.