I Have A Salvador Dali Collection Of The Twelve Tribes Of Israel In Both Gold And Silver. They Were Struck In 1973. Can Someone Tell Me How To Find Out How Much They Are Worth?

Go to your local library and look for a book called, "The Standard Catalog of World Coins 1901-2000" it gives the value for every world coin (yes, it is a big book) made in the 20th century for various conditions.