The odd ‘one’ out

You might well spot an odd stamp it if you knew you were looking for it. However, if you weren’t expecting there to be an odd one, and looking at the sheet of 100 stamps was routine and familiar, I dare say we all might miss it. I wonder if that explains why there is only ‘one’ Treskilling Yellow?

As you might expect, there’s been quite a bit written about ‘The Treskilling Yellow’ which, would you believe, is now a registered trade name. In philatelic circles it is also known as the ‘Swedish 1857 3 skilling banco error of colour’. It should be a ‘green’ stamp, but it’s yellow, and more importantly this error of