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Werner Gerth's Black 13 profile is definately wrong, it should be a black 13 with white trim and the swastika is also black with white trim. the eagle wing exhaust is outlined in white for 11th staffel but also for 10th staffel. 12th staffel was yellow and 2./JG 51 coming in as the fourth staffel for the Sturmgruppe had a red trim. Black 13 is shown right after the massacre of B-24's on 7-7-44.
Unger flew yellow numbered a/c in 12th later 15th staffels not red. the yellow 17 is in May of 44 after the unit started receiving some of the heavier A-8/R2's and 12 staffel had it's A/C fitted with the rearward firing rocket mortar which was a otal failure and they had it removed and replaced with the fuel tank