Section, act June 27, 1934, ch. 847, title II, Sec. 218, as added July 14, 1952, ch. 723, Sec. 8, 66 Stat. 603, authorized a credit for application fees paid in cases where an application for mortgage insurance under section 1743 of this title was received on or before March 1, 1950, and the mortgagee applied for insurance of a mortgage under section 1713 of this title with respect to the same property or project