I don't know how to tell the difference between originals and official restrikes. I would assume PCGS knows the difference, but mistakes are still possible.
As for how many originals survive, it's hard to say. Since the coins were struck, Hungary has suffered through two World Wars, a couple of uprisings, and several decades of Communist rule; such things tend to see collector coins (especially gold ones) returned to the melting pot.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis