Re: ID of Staffel code within KGzbV1 of 1Z+IZ?
According to our notes, such an aircraft would be of the 15./KG.z.b.V. 1 which was part of the IV. Gruppe. This unit existed from April 1940 to the end of the war (as 15./TG 1). The rudder code was "D".
The insignia that you mention is not a Gruppe insignia, so it must either be a Staffel or a personal insignia.
HLdZ
DGS
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