Wojtek, that neusilber wappen is a spare one I already own, -and can't use -I had it fixed after it was broken by an idiot at an Arms Fair. Just posted it to show why I was looking at the Landwehr wappen in the auction.
Darn it Jeremy, you got there first! So there it is : looks genuine, just not in great condition. Also, from my point of view, not brass, not EM, so I'm out. But I got a great lesson about Landwehr wappen so all good. Also now know someone worse at photography than me.