ANK No. NBE. 29
Numiscover "Joint issue with Slovenia"
With 70 cents block edition "Adelsberger Grotte, Höhlenpostamt 1899" ANK No. 3087, Block No. 79
and special cancellation 1060 Vienna from April 6, 2013
with a 2 Euro commemorative coin "800 years of Postojna Caves" from Slovenia
