Horological Meandering

Bought this used recently. Feel its the pinnacle of Oris .. you know when a small company puts its heart and soul and destiny rewards it with a masterpiece. The watch has gorgeous looking front skeletonization, back is also very beautiful, what a bracelet...  

thanks

To watch or better to say to notice that this big mainspring is unwinding must be cool. The diameter of the spring should grow, very slowly? 🤔

yes, when fully wound its tightly packed and smallest in diameter...and over days you can see it spreading out .. that itself would have been sufficient as power reserve indicator. Just remembered, it takes close to 80 tourns of the crown to fully wind it...