I have run across a hammer mill I am thinking about buying, it is an IH, and I thought at first it was a 4E, but I believe it is something older than that. In looking over the internet, I see a 4E and a #6 that were built in roughly the same timeframe. Did IH ever make a mill that was a bit bigger than a 4E, but smaller than a #6? I looked in CH Wendel's 150 Years of IH book, and found one that resembled it. Said it was designed with the F12 in mind but was never produced commercially.