The front image in the original posting appears to be a printing from a poorly wiped plate. The left margin, in particular, shows ink streaks. A view of the reverse would very probably not show a bluish cast to the paper.
The second image of the original posting shows the back of a different stamp, so I am confused about what it is supposed to show.
You need to investigate other things before you think "blue paper". It has to be a Perf 12 stamp. Yours is a perf 10.
So, you might consider learning about the stamps first-- perfs, watermarks, types (2c and 3c), and then varieties after you have the basics first. It will help you in the long run....hope this helps, Ray
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