The 1973 10c coil (Stanly Gibbons 1515, Scott 1509) comes with a variety of color shifts (location of the red ink on the stamp) from the small the the large.
I have collected just the extreme cases of color shifts as a curiosity to high speed 2 color printing.
The 2009 Stanly Gibbons simplified catalog does not mention these color shifts for this stamp although they might be in the detailed catalog.
The center stamp has the correct color registration for reference.
