If any claim or claims be submitted to said courts, they shall settle the equitable rights therein, notwithstanding lapse of time or statutes of limitation or the fact that the said claim or claims have not been presented to any other tribunal, including the commission created by the Act of March 3, 1851 (Ninth Statutes at Large, page 631): Provided, That any decree for said Indians shall be for an amount equal to the just value of the compensation provided or proposed for the Indians in those certain eighteen unratified treaties executed by the chiefs and head men of the several tribes and bands of Indians of California and submitted to the Senate of the United States by the President of the United States for ratification on the 1st day of June, 1852, including the lands described therein at $1.25 per acre. Any payment which may have been made by the United States or moneys heretofore or hereafter expended to date of award for the benefit of the Indians of California, made under specific appropriations for the support, education, health, and civilization of Indians in California, including purchases of land, shall not be pleaded as an estoppel but may be pleaded by way of set-off.