WW2 1st Anti Aircraft Division pair of felt cloth formation sleeve badges

A scarce original Second World War period '1st Anti Aircraft Division sleeve badges in the form of large Isosceles triangles each embroidered with black 'German Dornier bomber aircraft' pierced by red sword taken from the arms of the City of London, on light blue felt backing within black stitched border. Good condition, minor service wear. Height approx 78mm.