San Martín acquired the curved saber during his stay in London, shortly after he left Spain and before embarking for South America.
Following the withdrawal of San Martín to Europe, after the Guayaquil conference, the weapon remained in the city of Mendoza in the hands of a family friend.
In a subsequent letter his son-in-law, Mariano Balcarce, was asked to send him the sword in Europe, and it remained in his possession until his death on August 17, 1850.
As his executor, and pursuant to his last will, it is my sad duty to inform Your Excellency this painful news, and the honor to inform Your Excellency the following provision in his will: "3rd The saber that has accompanied me throughout the War of Independence of South America will be handed to the General of the Argentine Republic, Don Juan Manuel de Rosas, as evidence of the satisfaction that as an Argentine I had when seeing the firmness with which he has held the honor of the Republic against the unjust pretensions of the foreigners who tried to humiliate her"[1]Rosas in turn bequeathed the sword to his friend Juan Nepomuceno Terrero, and after his death to his wife and then their sons and daughter in order of age.
At that time the Regiment was granted definitive custody and the sword was placed inside a screened gazebo which was built for the purpose, donated by the City of Buenos Aires.