Great! Thanks for clarifying this, Victrix.
That does also mean, that this piece here:
https://www.hermann-historica.de/de/...s/lot/id/33749
is also to date as early as 1618 - 1628. I was always assuming that the helmets with the higher calottes (like the one in the link of my last entry) where more early (around 1630). But that means, that also earlier helmets have "medium high" calottes. Am I right?