The 58 victory rudder, I'm sure is Galland's 5819, the dark spot is likely on the photo rather than the rudder.
At this time the rudder had been repainted Yellow with the victories repositioned higher.
This Messerschmitt Bf109G-6/U2, WNr.412951, White 16 of I/JG1, landed by mistake at Manston in the early hours of 21 July 1944. It was flown to the RAE and became TP814. Bf109G-6/U2 was used for tactical trials by the Air Fighter Development Squadron until crashing on take-off in November 1944
Hello,
This red band was actually recognition for all Reichsluftverteididgung (Air defense of the German territory) units. This plane belonged to JG 301.
Spielmann
1./JG301, Two non the less landed at RAF Manston. Through pilot error, W.Nr. 163240 with I/JG 301 landed in the early hours of July 21, 1944. Thinking he was going to overshoot the runway, he raised the landing gear to slow himself, and did considerable damage to the AC. , A day later the one in the picture, W.Nr. 412951 also belonging to I/JG 301.