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

[davidjackson]

My lay opinion is simply that the style of illustration was popular in the first three decades of the 15th century, and both Lauber and the VM picked up on it. It's very much an evolution of the late 14th century illustrative style and carries onto the middle of the 15th century, until it runs headlong into the printing craze and is dropped.