The ID Petrus gave is correct. The link Petrus gave gives you the current catalogue value. It's not super-rare, but neither is it the type of coin you should be finding in a coin dealer's "Foreign Coins - 3 for $1" bucket. In this condition it's still worth somewhere around $50, perhaps a bit less given the corrosion spots.
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