2 cm Flakvierling auf Fahrgestell Panzerkampfwagen IV aka Mobelwagen prototype. Apparently, only 1 prototype of mounting the 2 cm Flakvierling was produced before the decision was made to mount the 3.7 cm. Flak 43 instead. And possibly even that prototype was reconfigured to mount the 3.7 cm Flak 43. The pictures of the prototype show no insignia, nor any camouflage, so it's a bid bland. The vehicle itself also is pretty clean given that it was not in combat.
Anyway, starting to see the finish line. Need to weather and try to get some contrast.