This is a US Scott #O18 Mint Hinged Official Dept. of the Interior stamp with a denomination of 6 cents. The stamp comes in an orange color and is categorized under Stamps, United States, Back of Book, and Other US Back of Book Stamps. The stamp is of VG/F grade quality and has hinge remaining. The certification status of this stamp is Uncertified. It is a great addition to any stamp collection.