(4)The Collector may thereupon, notwithstanding anything contained in the order admitting such instrument in evidence, or in any certificate granted under Section 42, or in Section 43, prosecute any person for any offence against the stamp-law which the Collector considers him to have committed in respect of such instrument :Provided that -(a)no such prosecution shall be instituted where the amount (including duty and penalty) which, according to the determination of such Court, was payable in respect of the instrument under Section 35, is paid to the Collector, unless he thinks that the offence was committed with an intention of evading payment of the proper duty;(b)except for the purposes of such prosecution, no declaration made under this section shall effect the validity of any order admitting any instrument in evidence, or of any certificate granted under Section 42.
