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[Hermes777]

the eagle was an ancient Illyrian symbol

Thank you, Cvetka for the images, unfortunately I don't see their dates. My question was just about the possible identification of the date of the image, based on the position of the feathers of our "eagle".

The VMs roots look more like a pair of wings

Eagle or pair of wings, what matters in my question is the position of its feathers to try to determine the date of the image. However, this is clearly not a vol.

Given a context of alpine northern Italy the obvious heraldry suggested by the "eagle" motif is the coat of arms of County Tyrol. The original coat of arms is still to be seen on the altar at Tyrol Castle circa 1370s.

The Tyrolean eagle is red, why should the colours be reversed?
Besides that, there are other root animals in the manuscript, why rely only on the eagle? I think Nick was talking about these images in his book.

As a general proposition regarding "root animals" in the ms. I offer the example of an eagle or hawk which may indicate herbs beneficial to the eyesight or even, by extension, to spiritual vision since such birds ascend (vertically) to the heavens as well as having acute long-seeing. Similarly, a herb good for lower back pain might be depicted with scorpion forms, correlating the scorpion with the lower spine. And so on. I haven't really investigated this, but I find it notable that there is no correlations to the human body in the work. No charts of the human body. No herb = zodiac = anatomy parallelisms. In which case, the correlates with the body and its organs may be indicated through zoomorphic stylisations of the herbal illustrations. This zoomorphic habit in European herbalism is still evident in popular and some botanical names: "Leopard's balm" etc. plant names that refer to animals. 

I know even less about heraldry. I only point to the eagle because it looks a bit like the Tyrolean crest, but I don't know.