США # 581/596 (Perforation 10x10)

valera_foto, I think nobody really knows which questions you have about which stamp here, there are different stamps and many scans you showed, but nearly no text.

Perhaps I can help you: Do you think you have a rare stamp? If yes: Which of the ones you showed in this thread do you think it's a rare stamp and why?

the stamp with some strange kind of perforation 11 (York PA) has setoff, so is not rare.
the stamps with perforation 10 are just normal stamps with perforation 10, so not rare.

I get that, and I agree with you there. I just couldn't understand your vehement declaration that "The York PA stamp is NOT 11 x 11," which was posted over an hour after valera_foto posted an image of the stamp in question with a perf gauge of 11 on all four sides.

1. we don't know which perforation gauge that is, at least it's not an US specialist gauge
2. as you can see the perforation does not fit at all at the left side, so it's not a perf 11. the right side seems to fit but the perforation looks scissor-made to me.

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after all I am also interested what is going on with this stamp, as the color and the setoff would say "flat", but the perforation not. We have to wait for the experts writing something about this.

the difference in perforation may be associated with a size (YORK PA.).
Mark is smaller in height.....?

I think that for each of these brands, need separate approach. As for the sizes, colors, and including perforations, And I would like to hear the opinion of experts ...... To this around the, could not to leave without attention Scott 632. I want to draw Your attention to the perforation..... perforation (11.25x10.50) although in the catalogue (11.00x10.50) I wanted to ask why....?

Why to measure the perforation there are sensors with the specified dimensions.
http://www.stampsmarter.com/learnin...rfGauge.html
for example (10.75 10.8 10.9 11.0 11.1, etc.) but the measurement data is not fixed in the catalogs, or maybe I'm not measuring it correctly .....
Why it turns out that on one stamp there are three different sizes of perforation.
Or such cases are not taken into account .......?

Try matching the dots on the perforation gauge to the holes of the stamp perforations.

made a measurement of the perforation of this brand .....

I tried to measure Scott 596
https://siegelauctions.com/lots.php...B&page_no=25
it also has an unequal value of perforation 11.
has (10.9 11.1 10.8) .....
Yes, I agree that no one will believe me in this
But for me it's all very interesting, why so .....

Rotary printed stamps have dimensions that are slightly different from their own? On plate analogues due to the curvature of the cylinder. If the plate is wrapped around the cylinder from top to bottom (at the end), then the design is slightly longer; If you wrap around from side to side (sideways), then the design is slightly wider.
If I understand correctly, then the construction of scott596 can have different sizes of cartridge, sometimes higher, and in some cases wider,
means the size (19.25 x 22.5) is not a requirement for scott596 ...

if a stamp has setoff, green ink spots, on the paper on the back, then it is not rotary.

tell me where you can read in the article, if the brand has fading, green spots of paint, on paper on the back, then it is not scott596 ...
I can not find the information .....

If a rotary stamp has setoff ink then chances it picked it up as the gummed stamps were being rolled at the end of the process; resulting in a small amount of ink on top of the gum.
Look. Can this a small amount of ink ....?