top right corner of f1r, possible inscriptions

[oshfdk]

I wasn't able to detect AR feature as a single shape, but there is some new information about some of the elements.

Given that the model for the right leg of R highlights red paint in weirdos, I checked what would red paint model highlight. Among other things it displayed a very clear inverted V shape consisting of the right leg of R and the bottom part of the diagonal stroke. It is possible then, that R is actually a combination of a diagonal stroke in text ink and an inverted V mark of some other kind.

I trained another model on this inverted V shape, it highlighted a rectangular feature at the bottom right of the page. This could be something like an offset of a rectangular label on the inside of the front cover, or maybe something else entirely. Maybe the inverted V feature is an offset as well, I can't tell really.

I made then a visible text ink model off the main text, which highlighted the diagonal stroke of the R feature and the folio number, but nothing else in that corner.

As the last resort I put the proposed shape of the AR feature over the scan, using the holes in vellum as guides, and recreated the shape for training. Nothing new was detected this way. Various elements are highlighted on the page, consistent with the idea that AR shape can be a combination of different kinds of marks.

   

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I also placed the flipped version of 1v over 1r to see if any of these shapes could be explained by anything that happens on the other side of the folio, but couldn't find anything.

So, that's what I found in the upper right corner:

   

Hope this helps!