pjr wrote:
Quote:
I'd account for the small portion of set-off with straight edges by assuming that the straight edge of an object like a ruler was accidentally pressed on the stack of damp sheets.
Presumably you are referring to the reverse of the 3c green being shown.
The bottom straight edge of the setoff design was simply the bottom end of the design. The top straight edge could have been created in more than one way, but I suspect that the most probable cause here was due to the outside edge of the sheet laid upon the sheet whose printing we are seeing as the offset. In other words, there was a sheet on angle between the source of the reverse side print and the paper that received it.