I recently bought a #7 that I judged must be from the bottom row of Plate I. I thought this to be the case based upon the color and the fact that there was no blur over the top margin. I've compared it to other stamps that I know are from Plate 1E, and I'm no longer so sure. I know that stamps from the lower left of Plate II don't always have the distinctive blur, and I'm beginning to think it from the bottom left row of Plate II. There aren't enough plating marks to help me decide.
Any help is appreciated. The scans is at 2400dpi.