The fuselage number isn't in shadow, but I quite agree about the perils of relying on my crude method of comparison.
Most of my refs simply state that the a/c belonged to SG 2. Kagero go further, but contradict themselves by stating I./SG 2 in a photo caption and II./SG 2 for their accompanying profile! Going by Schiffer's "Luftwaffe Codes, Markings and Units 1939-1945", SG 2 had three Staffeln per Gruppe, and black or red would correlate with number 2 or number 5 Staffel (and 8, 11 and 14 - but they wouldn't fit the suggested Gruppen), with black being increasingly common as the war progressed.
Another interesting thing with this a/c is the obsolete tactical markings of yellow wingtips and lower cowl that Ken Merrick highlights. Kagero's profile and Tamiya both show the later underwing chevron (which you can see on other SG 2 machines), so there is also a chance that the aircraft was repainted at some point after the photo...
I'm tempted to ask Jerry Crandall if he has any more info on the a/c, but he may well say Ken has it right.
All the best and thanks for your help
Rowan
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