Congrats on your find and great deal! I have been looking for one of those for years for my type set and have yet to find an attractive one for a good price.
I believe that it is worth $150-200. However, make sure it is genuine because there are many fakes of this type, some better than others. I am in no way implying that your coin is fake, but I would always err on the side of caution. However, I strongly doubt that your coin is fake.