According to the caption of a photo on page 43 of "The Luftwaffe, From the Training School to the Front" by Meyer & Stipdonk [Schiffer, 1996], a Kl35B wearing this emblem belonged to FFS A/B 72 Markersdorf/St.Polten, Austria.
We also have a thread on the LEMB
here showing an Ar76 coded DB+UI wearing the same emblem...
Cheers
Peter D Evans
LEMB Administrator