Christine is absolutely spot on there Neil53.
I have one in Neodymium , and surprisingly, another with a Bleikristall label which I think is genuine enough in your colourway.
But the M. Janku is Zelezney Brod.
Here are some pictures of each. The Bleikristall has no signature, just a label, but is so like the ZBS one, I wonder if
M. Janku worked there for a while??
You may point it in my direction if you ever want to sell it Neil53.....one can't have too many hedgehogs!!