What Is This 2-Cent Stamp From 1871 With "Us.inter.rev" And "Proprietary"? (See Pic)

I wasn't able to find it on my Scott Catalog :(



Thanks!

*** Moved by Staff to a more appropriate forum. ***

Looks like a RB2 to me. Anyone else?

Yes. Just look under "revenue" in the specialized and go no further than the fist issue

Peter

In what section do I find that in the US Scott Specialized catalog? What does RB stand for?

Oh I see, Proprietary Stamps! Thank you!

This is the violet paper.

I see RB2a. But how can you tell the difference between violet paper and green paper?

Actually there are three papers; violet, green, and intermediate (which usually looks greenish but is actually a violet paper). Besides a direct comparison, the best way to be sure of which paper it is is actually by the vignette. Although Scott lists both as being black, the green paper vignettes are actually sepia. And they tend to have a shadow on the reverse as well. With the intermediate papers, the vignette is also black. And they glow violet under UV, whereas the green paper glows bright green. Which is why they are considered violet papers, even when they look greenish to the naked eye.