A fine original WWII German Luftschutz Feldgendarmerie (Police) sleeve eagle here. Some residue remaining from what looks to have been a paper tag on the reverse. Good condition. A more rare variant embroidered on gray/blue Luftwaffe style backing to indicate Luftschutz use. 
 
The Feldgendarmerie were a type of military police units of the armies of the Kingdom of Saxony (from 1810), the German Empire and Nazi Germany until the conclusion of World War II in Europe