This aircraft marking is a perfect match for the cat on the Nutrocker decal sheet which represents the insignia for the 503rd Independent Heavy Battle Car Battalion.
According to the source (The German Federal Archive), the photo is a picture of the unit emblem of 2. Jagdgeschwader 20 though it is somewhat unique in appearance. The 'arched cat' of 2./JG 20 was typically depicted in a white circle with the tail pointing away from the body, however I have seen quite a lot of variation in some staffel markings ...
"Jagdgeschwader 20 (JG 20) was a Luftwaffe fighter wing during the early phase of World War II in Europe. JG 20 was founded on 15 July 1939 in Jesau and comprisedof just one Gruppe and two Staffeln. A third Staffel was added on 5 November 1939 in Brandenburg-Briest. The sole Gruppe was redesignated as 3rd Gruppe ofJagdgeschwader 51 (III./JG 51) on 4 July 1940. During the Battle of France it was subordinated to Luftflotte 2."
Oberleutnant Georg "Murr" Schott, a 16-victory ace and the Staffelkapitän of 1./JG 1 also had a similar black cat painted as a personal motif on the side of his Fw 190 A-6 "White 11".