Hi Johannes,
http://forum.12oclockhigh.net/album....pictureid=1952
That is a very good question as the markings of the He 162s of JG 1 are open to speculation. The current assumption is based on this photograph of the personal aircraft of Oblt. Karl Emil Demuth, who deZeng & Stankey say was
Kommandeur of I./JG 1 from 15 January 1945 to 12 April 1945. As Major Werner Zober did not replace him until 1 May 1945 and it is Demuth's victory markings on the tail, it is assumed the makings are that at
Gruppe level ... double digit in the 1x numerals and nose rings denoting commanding rank. In this case from the nose tip, the colours are red, white and black.
Based on this assumption, it is further assumed that those He 162s marked in the double digits in the 2x numerals represent aircraft of the
Geschwaderstab. And the nose rings of commanding officers are from the tip, black, white and red.
For what it is worth, Wolfgang Wollenweber of 3./JG 1 on page 133 of his
Thunder Over the Reich, (Crecy, 2012) captions an illustration as "Kommodore Herbert Ihlefeld flies an air defence mission in his 'White 23' in the Flensburg area."
May I ask what is your source for associating Ihlefeld with Yellow 5?