It is a piece of horological history - so do not restore the watch.
It will cost you a fortune if you sent it to Patek Geneva - you can save these bucks for another watch.
All you need to do is:
Look for a skillful watchmaker who is trained to clean and lubricate Swiss watches - he will easily do the job for about 100-200$.
He also can insert a new crytal at a fraction of what Patek is asking for the same.
I would keep the dial untouched as it is still very readable. There is no need of restauration. A restored dial will reduce the value of the watch for at least 30%.
If you still decide to have it restored you can mail me with a private message and I can tell you an adress of a professional restorer - or maybe I can assist you.
kind regards
erich