i have never heard of this watch. . .but if correct (and i assume it is given vacheron's involvement) this is one serious unicorn of a watch https://www.phillips.com/article/41...nt-wristwatch-found-after-decades-long-search
Not everyone is anal about a dial, so you can have a choice. Many rare watches in PP's collection have been redialed, as long as you keep the original the choice is up to the new owner. Personally I'd wear the new dial, I'm not interested in looking at a stained, pitted, corroded, discolored radium dial after splashing out perhaps a million dollars. Curious how the perpetual calendar is set as there is no month indication.
Look at the dial side of the movement at 12 o'clock, you can clearly see the rectangular satellite cam on the larger 12 sided month can that indicates the 29th of Feb every four years. That calendar mechanism is perpetual but there is no month indicator on the dial....at the request of the owner to cut down on dial clutter. Unique for sure. Perhaps the perpetual calendar mechanism is non functional now but it started its life as a perpetual calendar.