Hello! This is a steel Luftwaffe stamp. It says

"Kfz. Werkstattkompanie (0) d. Luftwaffe. 102/VII"

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

My grandfather kept it after the war (it was his unit) and I'm trying to find out if there is a market for such items. I haven't had any luck so far anywhere. Apparently, these things are either not common or not sought after.

I'd be very grateful if anyone could point me in the right direction, either guesstimate what it might be worth or who might be interested in buying it.