You mentioned Blancpain and that was why I was confused.
Anyway, the link Fratello shared was to one post about the topic where I disputed the attribution to Natalini.
This post I made was the proof after I spoke to Natalini’s business partner of 30 years and he confirmed that Natalini had nothing to do with any watch designs:
https://www.watchprosite.com/show-forumpost/fi-6/ti-1590706/pi-15859486/
I’m glad that the myth has been dispelled.
The likely designer would have been an in-house designer for GP with design suggestions from an Italian GP distributor. Inspired by the octagonal dome of Florence Cathedral (Italian: Duomo di Firenze), formally the Cathedral of Saint Mary of the Flower (Italian: Cattedrale di Santa Maria del Fiore.
🤝