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

[Koen G]

Those are good points, R.Sale. But on the other hand, three decades is an eternity when it comes to the fashion of the elites. When you look up specialist overviews of fashion developments in the early 15th century, you will see that they can make several distinctions even within this period. My impression is that the 1400-1430 timeframe already includes a certain buffer to allow these fashions to go out of style. Anything after than is really old-fashioned. It was also a time when Europe's courts were particularly connected (art historians speak of the international gothic) so regional differences may also have less of an impact than you'd expect.