75th anniversary of the Zeppelin

Set of 6 stamps.

5um LZ-4 over hangar.
10um, Dr. Hugo Eckener and Schwaben (LZ-10).
12um, Hansa (LZ-13) over Heligoland.
20um, Bodensee (LZ-120) and Dr. Ludwig Durr.
50um, Graf Zeppelin (LZ-127) over US Capitol.
60um, Hindenburg (LZ-130) over Swiss Alps.