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I also showed the Trial Color to Jack Daley, and we're both hoping that it's a stamp-- because if it is, it could be the first ID'd shade of rose scarlet.....since you're an essay/proof collector, do you have any examples of #65 Trial Color proofs, and does it look like a Trial Color Proof to you?
This just goes to show you how far apart two scanners can be in rendering the same thing. The example of #66 in the Kelleher sale (link above) looks very similar in shade to your example which started this thread. Here is an example of that same stamp which Siegel is about to offer next week: [the link editor here is truncating the full link, so you will have to go to this link and then follow the contents page to lot 151]
http://www.siegelauctions.com/dynam...sale_no=1078If you've seen the Siegel item (lot 151) note the shade difference in what they are offering as the same thing as your 66TC6 and compare that shade to something I am about to show you below.
Sorry I mentioned India paper on this, Ray. Given the perforations it is a bit of a red herring. Except for privately perforated India paper proofs (faking stamps) they are always imperf. But the look of your paper is really that of a rather hi-brite stamp paper. Some of the paper used for issued production was of this brighter grade, but they also tried out a host of patent papers and specialty papers with these. If it were my field I might be able to be more specific, but as it is I should leave that for those who really know. However, I do know that some rather thin, hi-brite paper was used by National in the Bank Note era, even for regular production. Not sure how long or how often however.
Here is a scan of some things from my collection that might contribute data to what you are looking at with your pieces. On left is a 65-E15h on a paper Scott describes as "semi-transparent stamp paper." The PF cert that came with it was from 1986 when this was still being called #56, so the color nomenclature was "brown rose." I think it looks more like "dim deep red" in the newer listing.

The other two stamps I have grouped with the issued #65s, but the stamp in the middle has always been a bit of a conundrum to me. It has a particularly whitish paper, and the impression is as "proof-like" as issued stamps ever come. In these regards it is like the essay on its left. I regard it as an early state of something, but it may just be from an early run on a new plate.
Here are some close views of the paper and printing. The upper pair are the two left stamps; the lower are the two right stamps, counting the stamp in the middle both ways. I honestly believe the quality of the impression on the stamp in the middle is better than that of the essay item. Its color is also more brownish than the usual rose (on right).

Have you seen this before? Does it contribute anything to your potential stamp versus essay question?