Vertical pair the airmail stamp over 40 Din. In mint never hinged condition with the variety "enlarged stamp format of the lower stamp", besides has the upper stamp 21: 15 perforation holes and the lower stamp 21: 16 perforation holes. Very rare. The lower stamp is expertized Novakovic, certificate Kleymann (2017) : "it is a sheet with 10 stamps combinations known. The condition is perfect. "