On the recordMarch 8, 1840
By a royal order issued on the 29th of April, 1832, by the King of Spain, in consequence of a representation made to his Government by the minister of the United States against the discriminating tonnage duty then levied in the ports of Spain upon American vessels, said duty was reduced to 1 real de vellon, equal to 5 cents, per ton, without reference to the place from whence the vessel came, being the same rate as paid by those of all other nations, including Spain.
Source
presidency.ucsb.edu
