A couple thoughts concerning the backs being printed at the same time as the fronts.What are the overstrikes for? Why did the American Lith. Co. strike a factory line and then overstrike a different factory over it?Were they used to change the eventual destination before they left the factory?Or, did they arrive at factory 649 and then receive the overstrike? Another thought: All five of these backs primarily display either brown or red ink (the very rare single overstrike in black being the exception). I've always thought that this factory (649) only had those two colors at their disposal since the same colors were used on both Hindu (which were created later and could've used any color) and Sweet Cap which remained red throughout the entire process.Rob