B 17 parts to identify

Hello boys!
I give up….After days on the net,impossible to identify one of the aero part of this B17(confirmed,history and fate well knowned),crashed in Belgium,and digged out by a friend..It’s the gauge part with "Azi" written..
So,it’s in your hands now…Can you help us??
One thing for sure,this is not located on the pilots panel.
I first thought for a part of one of the gunsight from the 50 cal,but ,obviously,i was wrong.Radio equipement may be?
Thank you Gentlemen!!


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