The Grandmothers of Plaza de Mayo this morning announced that they had rediscovered the identity of the 128th missing grandchild of their long four-decade search.
The Abuelas said they would hold a press conference at 1pm today at their headquarters at Virrey Cevallos 592 to provide further details.
The human rights organisation said "details will be provided" then and that they organisation would "celebrate this happy news with his family."
The Grandmothers, formed in October 1977 and headed by Estela de Carlotto, have now identified 128 children who were snatched away, given new identities and handed to new families after their parents were killed by the 1976-1983 military junta.
The grandmothers, now aged in their 80s and over, lost either a son or a daughter to forced disappearances for opposing the military regime, and in many cases, their babies that were born in captivity.
They believe as many as 500 children were given up for adoption to relatives or associates of the regime. Their parents were among the 30,000 murdered by the junta.