15 Years NSDAP service

[Simon's Silva Rerum]

Hello guys,   What do you think about this one? Genuine?

 

[landsknechte]

I'm not familiar enough with the medal itself to say one way or the other, but I am concerned with it being mounted solo as a medal bar.  The recipients of the 15 year long service were allowed to wear their old 10 year medal along side it.  I'd expect it to be mounted as a pair.