70r1 Pattern

[VViews]

Hi everyone,
I just can't find a good parallel for the "nebuly" pattern on the outer circle of f70r1. I figured I'd start a thread here to see if anyone has any such examples.
It's not really a cloudband/nebuly/wolkenband. It is like a regular circle with nine double scalloped protrusions.
Even if I ignore the nine, I can't find examples of lines that do this, alternating between flat and scalloped, let alone double scallops.
I think these patterns are unusual enough that identifying a match might give very interesting information about culture and background of the illustrator.
Here's the You are not allowed to view links. Register or Login to view. figure as a whole:

And the pattern with blue paint removed, not just because I'm a Voynich colors revisionist, but mostly to make the pattern stand out better:

I'd be really interested in any parallels others may have found for this pattern, obviously even more so if it's in a roundel!
Any ideas?