it depends on few things
1: If car is totally genuine and entirely FREE OF PAINT then it should cost you < 425000
2: Registration City matters: Cities like Islamabad, Rawalpindi, Lahore adds 25000 to price
3: If you buy Karachi registered car in islamabad or punjab then price is reduced by 25000
4: Duplicate book problem: I'd first suggest to not get into cars with duplicate registration books or if the seller is close and known contact then Cut down the price by 50,000
REMEMBER any extra accessories installed in the CAR does not add difference to the base price.