First of all, I would like to thank Vladimir for his work. It is not often that something interesting and new is shown. And also in such detail.
I took a closer look at your pictures. Not directly the binding, but the edges of the parchment pages.
They are overly discoloured, although they should have been protected.
This suggests that it has been exposed to heavy moisture for a long time and that the first binding itself has dissolved.
This would explain why something is missing and the order is not really correct.
At the same time, it would be the 3rd or 4th bond.
But someone who knows more about such spines and bindings would have to take a look. I don't have the experience here.
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