Another new one from same seller.
Interesting in that it only claims to be an "RB9", not an RB9a (violet paper, SCV $3,500) or RB9b (green paper, SCV $12,500). There is no "RB9" catalogue number in Scott.
However, it is priced most definitely as an RB9b. Per the image, the paper has a slightly greenish hue, however anyone familiar with the 1st Issue Proprietaries knows that there is a so-called "intermediate paper" which can have a greenish appearance, but for valuation purposes falls under the category of violet paper. Exact wording from Scott:
Several varieties of "violet" paper were used in printing Nos. RB1-RB10. One is grayish with a slight greenish tinge, called "intermediate" paper by specialists. It should not be confused with the "green" paper, which is truly green.
To my eye, the paper of the stamp in question is not green enough to be an RB9b. I would not touch this stamp as an RB9b without a cert under any circumstances. Now, if seller is willing to effectively take realistic RB9a money for it, that's a different matter... but that's not what the asking price indicates.https://www.ebay.com/itm/RB9-1-PROP...143276415412