Dear Jaime,
These knives were produced until a long time after the war, probably they are still produced today. The marking "made in Germany" suggests that this is not made to fool collectors. I was in the German boy scouts in the seventies and my knife was the HJ-knife with "made in Germany". Apart from that another obvious difference is the "diamond", which now shows the boy scout´s lily instead of the HJ swastika for obvious reasons
So somebody must have put your HJ knife into a modern boy scout scabbard.
I will try and see if I still find my boy scout dagger and post pictures here.
Cheers, Frank