With the help of "stampsmarter" I identified as Scott # 206 (reengraved design-shading in the Ornament above US).
This stamp was printed only of soft porous paper?(I asking because after "snap test" according my ear the result was "hard paper")
Dialysis, damned if you do...dead if you don't 20 Sep 2019 08:14:41pm
re: US Scott # 206
Snap test requires some experience, instead ID paper type by perf tips and backlighting.
Perf Tips
The stamp shown above is soft paper; it can be identified by the look of the perforation
tips.
Soft paper perf tips look fibrous, a bit ragged. Hard paper perf tips are typically clean cut, crisp looking.
Thank you,I read the article ...for backlighting UV I don't have possibility.
Two things I do:I don't have experience but I have a stamp with soft porous paper.
I post for comparation the Scott 206 and 205C (that I think).For me is not any difference(after "snap test" and "perf tips").With back white light the structure of paper,for me,it's the same.What you think?
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