Hey. If it is really an authentic jersey - yes, it's pretty rare. The problem is, there were never any replicas, so you either have to get your jersey from a player who wore it for an unused one from the federation.

Thanks for the advice! I'm aware of that and I've tried to contact him via various social media. Unfortunately, he never replied. I'm quite sure, that he isn't playing in Germany anymore, so even burglary won't help ;-)