Help Plating This 1857 12c 36B

I suppose it's a 36b because the outer frameline is broken and very light. And I'm assuming it was a "jumbo" where the vertical perfs were trimmed off, as I'm unaware of any vertically imperfed examples (even the 36c has perfs on at least one side).
But the design is taller than a 36 type I. Is that typical for a Type III?
Thanks

I would assume that this was a margin copy. An example of this:

This will help you plate the stamp:

https://d2jf3tgwe889fp.cloudfront.n...kmarked2.pdf

Or, you could download it from Stamp Smarter https://stampsmarter.org/learning/Home_USID.html
Don

From what I can gather, all perforated broken lines are from plate 3, which subsequently derived from the LEFT PANE of plate I.
Is that correct?
So in order to find out the exact number, I would need to check the position of the guide dot in the lower right corner.... great:( I'll never know.

Rogdcam is that your copy? The article claims that copies with the designer name are "extremely scarce"!

I do notice that it's on very thin paper with a yellowish hue compared to my other papers of this era. The article mentions a bamboo-infused, "part-india" material being used with the same characteristics. The article doesn't say it directly, but much like "pelure" or any other thin paper, the ink would undoubtedly also appear more crisp. I'll have to look into it further.
Thank you for the great reference

Stephen - Image courtesy of RAS.

Your stamp may be thin because it IS actually thinned as in damaged?

Oh yes there are multiple thin spots (which you can notice from both the backlit/unbacklit photos), but I doubt the entire stamp was thinned, and then thinned again in various areas.
I would argue that it was easily damaged BECAUSE it's thin paper, as you can see most thin papers in such a state.

Your stamp looks very much like a 36b. There is nothing indicating that it is a #36 from Plate 1. I am most likely wasting my time saying so but for anyone that will listen, there is no chance of this stamp being on part India paper.... wrong time period by almost 10 years.