Vertical pair the airmail stamp over 40 Din. In unhinged mint 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 signed Novakovic, certificate Kleymann (2017) : "it is a sheet with 10 stamps combinations recorded. The condition is perfect. "