Instructions
Visit an antiquities appraiser. He can tell you how old your coin is, where it originated from and help you record the specifics of the coin. Every detail should be included to ensure that the coin can be easily identified. Request a writ of authenticity.
Obtain proof of purchase of any coins. Receipts or transfer of ownership papers on registered coins will show you legally obtained the property. Do not do business with dealers who refuse to provide these documents because the legality of the coins could come into question.
Acquire ownership history of your coin. This shows that the coin is not stolen property. Many looters will enter excavation sites for the purpose of selling antique coins on the black market. You cannot prove ownership of a coin if you do not know who you are purchasing it from.
Provide U.S. authorities with an export permit from the coin's country of origin. Any coins not accompanied by an export permit could be retained by airport security.