Scott C18, the 50 cent Century of Progress Zeppelin stamp in Mint No Hinge XF-SUP condition. Attractive almost perfectly centered stamp.Scott C18 50 Cent Century of Progress Zeppelin XF-SUP MNH" is in sale since Sunday, October 10, 2021. This item is in the category "Stamps\United States\Back of Book\Air Mail". The seller is "rpederson2012" and is located in Clemson, South Carolina. This item can be shipped worldwide.