This thread is NOT about bank/teller stamps.
Pictured below is a 2013 $1 B/C note with a mysterious line running vertically from edge to edge. The line is located approximately 1/3 he way from the right edge on the obverse. The line, viewed under 10x and 20x magnification (loupe), appears to be under the design, and is detailed below running *under* some of the red and blue security fibers. The line does not show at all on the reverse, and is not detectible by touch (running a finger gently over it.) My initial assumption is that this hair line is either part of the raw paper, or is an artifact left after the first printing by one of the printing plates.
ALSO: This is the 5th or 6th note I've come across with identical (or nearly identical) marks. The commonality between all the notes: series 2006, 2009, and 2013 are the years I've witnessed, the line is always vertical, the line is always the same thickness and color, the line is always within the first or last third of the note (always runs through a seal/serial), and is always perfectly straight, and at a 90 degree angle to the top/bottom edges.
I would *love* to know the exact cause of this anomaly. Have you come across any of these? Thanks in advance for any and all replies!








Thanks again!
Dan