The C10, Lindbergh's Spirit of St. Louis, was produced in two versions - standard sheet format and also a booklet containing two panes of three stamps which Scott titles C10a. The booklet stamp is clearly different from the sheet stamp since both the right and left sides of the stamp have a straight edge with no selvage. However, a single stamp detached from the pane is not addressed by Scott - only the three stamp pane in either mint or unused condition. Since I happen to have one of the detached booklet stamps, what am I to call it? I wondered if someone could explain the logic to this, or is it just one of those unexplainable secrets of the universe?
