I think must be around 800k if in original condition, RHD, sunroof, ac working, soundless suspension, good engine, neat and clean interior and tyres are in good condition (remember 19" tires are hell expensive :p)(if it was isb or lhr registered then around 900k) . This is a good price so that when you sell you can sell it with less loss otherwise people are demanding 1000k for these machines.
And for these machines their worth is what you are willing to spend.
nowadays as even a new mehran costs around 600k.
Just my two cents.