I came across this Powell with a fine line running through the bottom.
Powell [3].jpg
It doesn't look like most of the other plate scratches and may have been caused by something different but there is another Powell and Hinchman
that have similar marks.
Powell1_1.jpgHinchman%202_1.jpg
I would guess that this mark was only on a few sheets. Powell and
Hinchman have another plate scratch that puts them along side each
other on this sheet and the line on this new Powell lines up with these two.
Powell%20Back - Copy (2).jpg