Greetings all...background: I have been studying WWI for about 30 years, and have acquired many WWI items during that time(purchased and found on WWI battlefields), including just such a badge (see attached photo). I found it at a Mons, BE outdoor market in 1983 just before I was scheduled to leave my assignment at SHAPE HQ. I purchased it for 30 BF (around 8$, US). At the time I believed it to be an original, and rare...only 100 tanks were used by the Germans in WWI, 80 of which were captured British tanks, and the remainder German-built A7Vs...the latter is pictured on the badge. I figure about 1000 of these badges were awarded...18 crewmen/A7V and 8/captured British tank. The badge I have has a maker's mark on the back..."Zeitner Berlin", plus what appears to be a small additional mark between the maker's mark and the hasp...looks like two stacked triangles or a barbed spearhead. As an aside, Herbert Zeitner was Herman Goring's favorite silversmith. I have other photos, but haven't quite figured out how to put on more than one attachment at a time. Cheers!