my suggestion about the author of MV

[Anton]

You're right. It's a characteristic "h" from a certain time period. Blog here:

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So... say, 1st half of 16th century. But I would draw your attention to the idea that the fact that the row is the leftmost does not mean that it was put down first. In fact, being too close to the right margin of the Voynichese text, I would not be surprised if this row was actually added up the last. What would be natural is that the row of Voynichese glyphs is first added right under the weirdo, then Latin letter options are added to the right. After it becomes inconvenient to use the (insufficient) space in the right, a new Latin row is fitted to the left. The Voynichese row would have been the first to be put down.

What about your dating of the rightmost row? Note that it has a very (?) characteristic "b", inclined leftwards.