Here is what I replied to "Anthraquinone", with some editing/additional info for here:
Here is a link to an article I wrote over 20 years ago about the varieties found on the 8c UPU stamp (Scott 648). It was reprinted in the
Corgi Times back in 1995.
http://www.adminware.ca/newsgroups/648.pdfI found 2 examples in some 1,039 used examples in my collection. It is not common.
It is stated earlier here on this thread that the "Unitrade says this issue was printed from 2wo panes." (a direct copy/paste). The Unitrade does *not* say this issue was printed from two panes. The pane arrangement for these stamps has not yet been reported.
The illustration in the Unitrade is from my own collection (one of the two examples noted above). On my second example, the red line just touches the bottom of the blue.
The position of the red line can vary due to colour shifts. In my example, the red line is below the blue; in "wert"'s example from the SCF, his red line is on the blue. Both are the exact same variety. I compared his example with mine (in Adobe Photoshop) and the distance from the red 'Canada 8' at the top of the stamp, to the red line at the bottom of the stamp, are identical.
Our two varieties may appear to be in "different positions", but they are not. One *cannot* compare the position of varieties of multi-colour stamps to other colours on the same stamp. There can/will always be a difference between the position of the different colours due to normal colour shifting of multi-coloured issues.
Robin Harris