Unknown Disk Erkennungsmarke

[necker]

Yesterday this came right out of the woodwork.

Bought it, but don't know what it is.

It's not military, they did not use names on the ID, but what is it?

Best,
Necker

[necker]

I already know now: it's a disc from the Reichsluftfahrtministerium, the namen "Hansen" is the name of the Firm which works for the RLM