7(1)For the purposes of duty under paragraph 1 (charge on issue of instrument) the market value of the stock constituted by or transferable by means of the instrument is ascertained as follows.U.K.
(2)If the stock was offered for public subscription (whether in registered or in bearer form) within twelve months before the issue of the instrument, the market value shall be taken to be the amount subscribed for the stock.
(3)In any other case the market value shall be taken to be—
(a)the value of the stock on the first day within one month after the issue of the instrument on which stock of that description is dealt in on a stock exchange in the United Kingdom, or
(b)if stock of that description is not so dealt in, the value of the stock immediately after the issue of the instrument.