Here is R64c with what I'm stumped what is going on. I have a few ideas but really don't know for sure what this variety is.
I've scanned the parent stamp in full and added arrows that point to the Areas of Interest (AI).
Then I've added camera images of where the arrows point to the AI.
There are other AI areas, but of little importance. No need to show many camera images. I've only added the camera images of the most important AI!
The individual camera images may not be the clearest, but are fully functional.
Stampmaster




