15c stamps valid for use on ALL US Mail. 4 different designs. 4 of each = 16 stamps. Unused MINT condition, post office fresh. Great stamp to get your mail noticed and many other uses. Mix & Match values to make the current rate. Perfect for party invitations Coral reefs Coral itself may constitute less than half the material found in a coral reef, which is a wave-resistant underwater ridge or mound built of fragments of coral, coral sands, and solid limestone. The reef may be at or slightly below sea level. Three forms of coral reefs are defined: Fringing reefs are located close to shore, normally separated from land by only shallow water. Barrier reefs lie farther offshore, separated from land by lagoons more than 30 feet (10 m) deep. Atolls are found far offshore and are made up of a ring-shaped reef enclosing a circular lagoon. Each of the four stamps of this set shows one type of coral and one species of fish found in coral reefs. VERY large stock of USA postage stamps. Other Etsy sellers charge up to 5x-10x what I charge. Ask for quotes for any issues. Vintage postage makes your mail stand out and is fun to use and share. Major supplier of Vintage stamps for collectors, art projects, fund raisers, promotions etc, Professional stamp dealer for over 40 years. Your satisfaction is guaranteed. See my other lots including vintage postage below face value. Save Money on your postage needs !