The Central Government may enter into an agreement with the Government of any reciprocating country

(a) for the avoidance or relief of double taxation with respect to gift-tax payable under this Act and under the corresponding law in force in the reciprocating country, or

(Explanation. The expression "reciprocating country" for the purposes of this Act means any country which the Central Government may, by notification in the Official Gazette, declare to be a reciprocating country.