A variety of EFOs are known for the $1 Yorkton, Saskatchewan, Court House 1994 Architecture definitive, but I don't think this is one of them. What it looks like to me is a color changeling, in which the brown has largely gone green (on the two large panels of windows on the front).
What suggests that it is a color changeling is the fact that the removal of the red (which, added to green, makes the tertiary color brown) is incomplete. There are still pretty obvious traces brown remaining at far left below the first-story windows, compared to the chartreuse around the top-right windows. This is very different from what you would see with a bonafide color-omitted error, in which no trace of the missing color can be present, even under 30X magnification.
Also, the faint smudge below the "N" of "CANADA" suggests that this color change may have been the inadvertent byproduct of an attempt to chemically wash away the cancellation on a used stamp so that it could be fraudulently reused to defraud
Canada Post. Perhaps the frugal fraudster figured that even if the result of his efforts might now deceive the mailman, it might still be salable to one of us stamp collectors.
Fred
Posted 05/24/2016 06:56 am
