Whenever prior to the effective date of this act the Tax Claim Bureau sold any real property at any private sale which was in conformity in all respects to the requirements of the act of July 7, 1947 (P.L. 1368, No. 542), known as the “Real Estate Tax Sale Law”¹ except any requirements of sections 610 through 612.1² or the requirement of section 613³ of that act, that such sale be made within one (1) year after the property was exposed to public sale and such sale was continued because no bid was made equal to the upset price, all such sales are hereby ratified, confirmed and validated and the title to any such property purchased by any person, and the deed executed and acknowledged to such purchaser, are hereby declared to be as valid as if the entire transaction had been in full conformity with the “Real Estate Tax Sale Law.”