Austrian badge

[Robert Noss]

I found that metal badge amongst a lot of junk on last sunday's fleamarket:



The size is 30 mm in height. It has four prongs on the back.
Is it austrian ? I suppose so, cause of the double-headed eagle.
For what purpose could it be ?
Shoulder straps ? Collar-tabs ? Cap badge ?
What period ?

I know, a lot of questions for a single piece, but maybe somebody has seen that badge before.

Thanks in advance
Robert

[Rick Research]

The pillars on either side are Spanish, I think. Will copy this over to International from Imperial.