Luftwaffe company seal

My grandfather was a first lieutnant in the Luftwaffe and kept the company seal after the war.
My mom wants me to get rid of it but I have no idea where to start. Looks like these items are not very common and I could not find anything about it on the internet.
If anyone could point me into the right direction where a buyer might be found or if it’s worth selling at all, I’d be very grateful.

The seal is made from steel, below is the stamp it produces. US coin added for scale.


Attached Images

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