Although the popularity of late marks with high production numbers is understood, I'd like to submit a contrarian point of view. Panzer IV A, B & C were the only ones to participate in the Polish campaign and at least in the case of B & C remained operational during the French, Balkan and Russian campaigns until withdrawal during 1943. One source I've looked at suggests the B was being operated by 21 Panzer Division in Normandy. Now I'm not suggesting these early Panzer IV's should take precedence over more numerous later marks but I think they can add interest to games over a reasonable number of years. I just hope they remain on a Rubicon to do list, even if no time soon.