No child shall be transferred to an adjacent district without the prior written consent of such child’s parent or legal guardian, or, where such child has neither a parent nor legal guardian, the prior written consent of the State Board of Education. Provided, however, transfers of children to adjacent districts prior to June 22, 1973 shall be rescinded upon the written request as provided herein and any such child for whom a request for retransfer to his former district is made shall be returned to such former district.