Opinion on miniature Nun Erst Recht

[carlhungus]

Hello,
Got this small badge in a lot, but will not keep it, as it's not in my theme.
Could you please confirm if it is genuine, and an estimation ?

It's a miniature, about 17mm. Back doesn't have an attachment. Seems never have one (or soldering remains have been cleaned).
It is nearly flat as a coin.

Thanks

[Zirnhelt]

Looks like an original.

[Wim Vangossum]

Looks like an original.

Indeed.

[salzmann]

[carlhungus]

Thanks all.
any idea of its value, without attachment ?