Gilles,
To my knowledge, they have not been reproduced. At least I have never seen a bad one. Of course, the front would be easy enough to copy, but the back would not be easy to get right. Anyway, I don't think this badge is widely known and there aren't a lot of examples floating around. Do you know something?
I got my example at the Gunzenhausen show in 1984 for less than $10.00. I almost didn't buy it, as I was not sure at the time about when it was made. Fortunately, I didn't pass on it. Replacing it now would be difficult and expensive.
Chip