WW2 Luftwaffe metal company stamp

My grandfather was a first lieutnant in the Luftwaffe and kept the company seal after the war.

Looks like these items are not very common and I could not find anything about it on the internet.

I haven't decided to sell it yet but 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.

Stamp says  "Kfz. Werkstattkompanie (0) d. Lw. 102/VII"



Would be "Motorized Engineering Company of the Air Force 102/VII" in English I guess.