4. Sri.N.L.Bitto, learned counsel for the petitioner submits that the impugned Ext.P-2 proceedings dated 27.12.2018 is ultra vires and unenforceable inasmuch as it is much beyond the period of limitation of 5 years for taking action as prescribed under sub-sec.(3) of Sec.45B from the date of registration. Sub-sec.(3) of Sec.45B of the Kerala Stamp Act, 1956 stipulates that the Collector may, suo motu, within five years from the date of registration of any instrument not already referred to him under sub-section (1), call for and examine the instrument for the purpose of satisfying himself as to the correctness of its value or consideration, as the case may be, and the duty payable thereon, and if after such examination, he has reason to believe that the value or consideration has not been truly set forth in the instrument, he may determine the value or consideration and the duty