Here is a link over to the HJ website which may be of some help to you on this piece.
Hitler Youth Forum - HJ DJ BDM and JM
Hallo RHJ. The one you show there is a modern copy. Here's an authentic badge for comparison:
Source: HJ Reichsführerschule insignia (Reichsführerschulabzeichen) - good one? - Hitler Youth Forum
There were versions of this badge for Marine HJ, Flieger HJ and DJ too:
Source: HJ Reichsführerschule insignia (Reichsführerschulabzeichen) for DJ and Marine-HJ - Hitler Youth Forum
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