I would indeed be very interested to know why her signature isn't present on all dial variants. And I completely agree with you that if you're going to own such a work of art, it might as well be signed (it even needs to be). For this reason, my personal pick would be the Geneva map: like you, I think such a masterpiece deserves a Swiss related dial, but, unlike you, I don't really respond to the steamboat/red flag scenery, whereas I find the Geneva map very nice.