This set of six mint stamps (three regular issue stamps and three airmail stamps) is a "Martyrs of Freedom" issue from Guinea that features portraits of the Rev. Martin Luther King, Jr., Pres. John F. Kennedy, and Senator Robert F. Kennedy. The stamps were issued on December 16, 1968, and have a retail value of $11.90 (2011 Scott Standard Postage Stamp Catalogue; a great deal at $3.65!). The height of each stamp is 35mm. (See item# AM7 for pairs of each of these six stamps, with each pair including an attached label with inscription).