The condition is very rare indeed, especially for the dial and case.
About the window, I'm not an expert but this is something that I saw on vintage yellow or rose gold cases sometimes. Between the lugs, parts that are not naturally touched often, there is this "purple" patina, sometimes blue. I imagine that a slight polishing (or even a simple cleaning with the right product) could remove it.
Thanks for sharing Patekova and we'll be happy to see your pictures in the future!
I don't know if you intend to wear it but I wish you to enjoy it
Best, Mark