Consequently the fort is considered to be 'the first city of Delhi'. Researchers now confirm that uptill 1913, a village called Indrapat existed with in the fort walls. Excavations carried out by Archaeological Survey of India (ASI) at Purana Quila in 1954-55 (trial trenches) and again 1969 to 1973 by its Director, B.B. LAL have unearthed Painted Grey Ware dating 1000 B.C., confirming the antiquity of the fort.
The above text courtesy from the wikipedia website. http://en.wikipedia.org/wiki/Purana_Qila,_Delhi
In my collection i have a vintage post card of the Old Fort, Delhi.
This is my Old Fort Delhi vintage post card.