I have a similar collection of Kraken rounds.
I've very briefly studied old manuscripts, ancient documents and a few old navigational charts for a time and I have come to the conclusion when it comes to chart illuminations, that not all navigators/map makers are artists, and not all artists are navigators/map makers. I'm tempted to do a little deep dive into where some of these designs originated form. Until then, it waits among all the other writing projects.

My favorite... on the left...

!PIMP