Are the 1430s the most likely date range for the Zodiac drawings?

[Mark Knowles]

In fact, until now, the one often repeated comment about Voynich MS drawings is that they appear to be original, if not unique.

Many of the drawings in the Voynich may appear unique and may be unique. I certainly am of the view that some drawings are unique and some other drawings I don't know.

However in the specific case of the central Zodiac drawings in the Voynich they appear clearly to be far from unique. In fact they seem at least highly derivative and I suspect complete copies without any originality at all. It is semantic question perhaps, but I use the term exact copy even if the copy is very badly executed.