Where:
(a) a person is employed by the Commonwealth as set out in paragraph (a) of subsection (5) of section 4;
(b) the person became so employed in circumstances specified in a determination made for the purposes of the definition of State employee in subsection (1) of section 107A; and
(c) during a continuous period that ended immediately before he became so employed, the person:
(i) was employed by the employer by whom he was employed immediately before he became so employed by the Commonwealth;
(ii) was required by the terms of his employment to give the whole of his time to the duties of his employment; and
(iii) was not a contributor to the State Fund;
his employment during that period shall be treated, for the purposes of applying subsection (5) of section 4 to and in relation to him, as if it were employment by the Commonwealth.