Hello,
The leather loop and the retainer strap of the scabbard seem to be white like the rest of the equipment for the special events. Interesting if you see such a HJ knife one day!
Musikschule | Luftzeugamt Kölleda – Gegen das Vergessen -
The students at the Wehrmacht and SS musicschools were organized by HJ, as in other specialist schools.
Here's a portrait of a student at the Luftwaffen-Musikschule Sondershausen showing the schooluniform.
.