не знаю то или не то, но вот что я нарыл
(тока орлы в другую сторону глядят)
http://freepages.genealogy.rootsweb.com/~bobwiss/coa-austrian.htm
 
"State of NIEDERЦSTERREICH  
Niederцsterreich was created as a Duchy in 1156 and became part of Austria in 1282. Around 1450 a large part, now mainly Oberцsterreich, was removed from the Duchy.  
 
The arms were officially granted in 1920. The arms with the five eagles first appears in 1335, as the legendary arms of the H. Leopold, who originated from the area. Around 1360 Duke Rudolf IV adopted the eagles as the arms of Old Austria. Ever since the arms represented Niederцsterreich in the ducal and imperial arms."
 
картинка
http://freepages.genealogy.rootsweb.com/~bobwiss/images/COA-NiederosterreichAust ria.jpg