Quote:
Originally Posted by Jobu
Thanks Steve - I am glad I added the "(I) might not be correct". 
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No problem, even an idea that's fairly close is pretty good.
In my other hobby I learn stuff all the time. I found a stamp I thought might be a really good one, printed on both sides. It happens, but rarely and almost never on modern ones. I showed it to a guy in our club who also knows printing, and he agreed that the alternate explanation was probably the right one. A double offset - Or, double WST. So a printed sheet, probably setup waste caused a WST on some other object, maybe a sheet put on whatever would hold the stack of sheets to protect them. Then the scrap was removed, and the first sheet in the stack got a WST from the inked protecting layer.
An interesting freak, but not an "error" which in this case probably is a difference of a bit over $1000

(The one I have is probably unique, but worth much less)
Just be glad that most cards were done by one general method of printing stamps are at least 5-6 different.
Steve B