Wealth tax exemption expanded to include defence deposit and national defence certificates, with a transitional non application for prior assessments. Amendment to section 5 of the Wealth Tax Act omits clause (xv) and substitutes clause (xvi) to include twelve year national plan savings certificates, ten year defence deposit certificates and twelve year national defence certificates as qualifying instruments, limited to amounts not exceeding the maximum permitted investment or deposit in each case; and adds a proviso that the amended clause (b) shall not apply to ten year defence deposit certificates and twelve year national defence certificates held by the assessee on the relevant valuation date for the assessment year commencing in 1963.