Definition: An approval service is a popular method of marketing coins and stamps, where the company sends you a selection of items to consider through the mail with no purchase obligation attached. You typically have 10 to 15 days to look them over and buy whatever you like, or none at all, and return the rest. The largest marketer of coins on approval in the U.S. is Littleton Coin Company.
Examples: An approval service is a great way to buy coins, if you don't mind paying really high prices for them.
