Pak-China border treaty was signed in 1963 on:

The formulation of the Pak-China border treaty or the SINO, Pakistan Boundary Agreement was accomplished on March 2, 1963, in Peking (Beijing). It was signed by Chinese Foreign Minister Chen Yi and Pakistani Foreign Minister Zulfikar Ali Bhutto. This agreement demarcated the border between Chinas Xinjiang region and Pakistan, administered territory of Gilgit, Baltistan.