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Hes says alone the 6c stamp has about 12 different Continental papers known. What I would like to know here: where do the experienced collectors (and maybe Scott) put the border between Continental and American from the definition point of view for undated single stamps?
The late Eliot Landau was a personal friend of mine. We shared a love of the Bank Note issues which dominated many of our conversations. One of the joys of our relationship was that we could disagree, sometimes heatedly, and still come out as friends. However, his tendency to extrapolate beyond evidence to inferred conclusions and then fight for them tooth and nail was the very thing that kept him out of certain philatelic circles. Eliot was an attorney who tended to marshal his "evidence" into a plausible case, even when it lacked good scientific demonstration. Plausible and defensible are not always the same.
The Chronicle article to which you are pointing was written and published in 2000. Its understanding of the paper chemistry in operation for the Bank Notes was limited in critical ways. In particular, Eliot attributed certain characteristics to variations in "bleaching" that we now know are to be understood in other ways. He wrote:
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From mid-1876 through February 1879, CBNC used progressively softer papers with a variety of bleaching intensities. In late summer 1878, CBNC started using a relatively uniform, mildly bleached soft paper and all stamps were printed on it by CBNC and ABNC until the introduction of the unbleached newsprint in summer 1879.
Eliot assigned the label "newsprint" to a paper type based on the popular notion of what that term meant at the time, i.e. a weakly sized, wood pulp paper with a high lignin content. Subsequent research by John Barwis (under a grant in 2011; a simplified version of the study was published in 2014 here:
http://chronicle.uspcs.org/PDF/Chro...43/21198.pdf ) demonstrated that in 1879 the paper being used by American was still a rag paper, as before, but now with a different sizing agent (rosin/alum) than used previously. Barwis further demonstrated that bleaching levels was not the variable that Landau had suggested as the marker for differentiation of varieties. That distinction belongs to the three principle paper sizing agents in use from 1873 to 1883: gelatin, rosin/alum, and starch.
In his exhibit of the 6c, Eliot had mounted face-down examples of his numerous varieties differentiated by bleaching. However, despite his claims that he had assistance from a research chemist at Argonne labs (a lady known to Chicago philatelists) beyond his exhibit I know of no published systematic work which substantiated his claims.
All of that is preamble to the response I wish to give to the question stamperix brought up: where ... put the border between Continental and American...for undated single stamps?
1. The point of distinction is not a matter of "definition" it is a matter of convention.
Until it can be determined exactly what
change(s) American instituted in the production of the rosin/alum stamps introduced by Continental in early 1878 and continued after the merger Feb 4, 1879, undated soft paper stamps are all to be attributed to American. This follows the precedent introduced by Scott decades ago.
This approach recognizes that there was no difference in personnel, machinery, plates, or point of origin before or immediately after the date of merger for certain denominations of stamps.