This is a 1986 coin from the Franklin Mint. It is in a plastic case with a blue inside. There is a slight curve at the bottom corner. The coin is made of solid sterling silver and is limited edition commemorating Halley's Comet - closest to the sun in February 9, 1986.
A great piece of history! The item "Franklin Mint Solid Sterling Silver Limited Edition Coin Halley's Comet 1986" is in sale since Monday, June 26, 2017. This item is in the category "Collectibles\Decorative Collectibles\Decorative Collectible Brands\Franklin Mint\Other Franklin Mint". The seller is "coopymathdoopy" and is located in Philadelphia, Pennsylvania. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, South africa, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Mexico, New Zealand, Philippines, Singapore, Norway, Saudi arabia, United arab emirates, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, China, Taiwan, Thailand, Israel, Switzerland, Ukraine, Qatar, Kuwait, Brazil.