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Actually, the OP said that #190 is on soft paper but that he thinks his example is not.
That is correct. My apologies, Don and all. Looking at the back, it's soft paper to me, too. For the record, and to add to our confusion, there are some transitional period Americans where old stocks of Continental paper were used up. Don, if you hold it to the light again and readily see a mesh, it's soft paper for sure.
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Even after more than 50 years of serious US collecting I still cannot get the hang of of the shade differences on the 30-cent large banknote.
Looking at the computer monitor I should be using, it
could be 190a, greenish black. But the Americans with even recent certs I've seen all have a bit of greenish tinge to my eye. The
typical 165a National greenish black is greener and grayer (maybe more due to the paper used), but there are shades of that and there's probably close to or even full black shades out there. We're also looking here at a blowup which makes everything paler, like the black card behind the stamp.
Yes, it's often a judgement call when it comes to the range of shades for the different 30c. There are even experts who say that identifying shades and colors is irrelevant on used stamps since they can be faded. Not that that can't happen with mint stamps, but they feel that a mint stamp is much more likely to be in the color as printed.
Other points are the strong cast of ink color on the paper (typical American), and (I'll get killed for this) the large overall size of the stamp which I would call a jumbo. The latter probably comes more from the surviving population of stamps I've seen, where possible very large Continentals and Nationals seem to have been largely reperfed. Those issues in general seem to be favorites with reperfers. The (super) jumbo Americans seem to have been targets to be cut down to try to pass as imperfs with supposedly large enough margins. It may be that the sound centered jumbos, seemingly all Americans, survived because old, old collectors were after centered stamps rather than jumbos, and there were just more American stamps that were like that.