And be it further enacted, that if before Payment of the Duty for which Credit shall be given in any such Case as aforesaid it shall become necessary to take out Letters of Administration de bonis non of the Deceased, it shall also be lawful for the said Commissioners to cause such Letters of Administration de bonis non be duly stamped with the particular Stamp provided to be used on Letters of Administration of that Kind for demoting the Payment of the Duty in respect of the Effects of the Deceased on; some prior Probate or Letters of Administration of the same Effects in such and the same Manner as if the Duty had been actually paid, upon having the Letters of Administration de bonis non deposited with, the said Commissioners, and upon having such further Security for the Payment of the Duty as they shall think expedient and such letters of Administration shall be as valid and available as if the Duty for which: Credit shall be given had been paid.