The same here. I have no idea. I can't tell you how long I've had this or where I got it from. It's very crisp.
Looks like the P-25 or P-26 on this website. http://banknote.ws/COLLECTION/countries/ASI/PAK/PAK-GOV.htm
This banknote was printed in 1987, and is no more in circulation but still a common series (pick 25). There are two variants in this signature (Izhar Ul Haq), one with 6 digits serial up in the center and second 7 digits serial to the right bottom.