It has only one constitution for now, like any other country. It is 1973 Constitution. But before that, there were 2 constitutions, Constitution of 1958 and Constitution of 1963. Pakistan came into being in 1947, so the constitution in place from 1947 to 1958 was the British Constitution. Hope you got your question resolved :) Regards, Musavir Gajani gmusavir@hotmail.com