Rod actually scored first, a couple of days ago. And now the rest of you have zeroed in on it. It is, indeed, a base Pzkw IV (H) chassis with a one-off experimental hydrostatic transmission. Putatively built to a request from the SS, and found at the factory in Augsburg, Germany, by a US Weapons Technical Intelligence Team, and brought back to the US, to Aberdeen Proving Grounds - more accurately known amongst the military vehicle grognards as "Aberdeen Rusting Grounds." The Ordnance Corps...