You can find a complete listing of Commemorative Coins on The United States Mint website www.usmint.gov. On there they have not only a complete list of the coins but also alot of other interesting information.
Commemorative "coins" are issued by different companies. The U. S. Department of the Treasury is responsible for the issue of cons that will be circulated in the U.S. Other companies, like the Franklin Mint, produce non-negotiable coins for special occasions, hoping that investors will find them a good investment. You will find a list of all coins issued by the U.S. Treasury. For lists of non-currency, contact the purveyor.
Find the coins.
You can find these coins on eBay, depending on condition, from $250 to $1500.
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If the coins are from the United States, the best bet would be to check the U.S. Old Coins Identification Chart. If the old coin is from the United States but not on said chart, it is probably a commemorative coin and a person would need to obtain a copy of U.S Coins Red Book
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You could start by searching the Coins section at Ebay and the other related links below, which are Exonumia, the Token and Medal Society, and the Coin Club. == == Commemorative Coins can be found in the current US Coins Red Book by R. S. Yeoman. For Commemorative Medallions, you would need to look at a book about tokens and medals. There is a group called the Orders And Medals Society of America. This is a group of collectors that collects medallions and are a wealth of knowledge and they may be able to help you. They also go by the acronym OMSA. (see related link below)
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Look in the yellow pages for Coin Dealers. If your local dealer doesn't have the Constitutional Commemorative dollar in stock, he will be able to find one for you at the next show he attends.