The Unusual 25c1Et

The vast majority of the 25c1E1 were printed with the watermark perpendicular to the image of the stamp. This constraint is caused by the use of a paper roll in which only one direction (left or right depending on the relative position of the plate to the roll of paper) is possible. The only way to create the 25c1E1t is to print in pre-cut sheets from the roll that have been rotated 90 degrees. Apparently, this is what happened.