Just noticed now that is says: Ist aus horn gearbeitet.Hi,
The regulation whistle (Signalpfeife) for the HJ, DJ and BDM is shown and described in a 1934 publication. It was made of wood. It was smaller than those you show and was of a different design:
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As with most things though, you will see different types of whistle in use in photographs. However, the whistle pictured above was the official type. See this thread for whistles of this design: DJH youth hostel (Deutsche Jugendhergergen) whistles
Just noticed now that is says: Ist aus horn gearbeitet.
So horn, not wood?