
In a festive post, mrds showcases the Vacheron Constantin Traditionnelle Twin Beat perpetual calendar, a horological marvel that challenges conventional power reserve mechanisms. This article delves into the technical intricacies of this timepiece, exploring how its innovative dual-frequency system redefines practicality for perpetual calendars. mrds's initial presentation sparks a discussion that uncovers the unique engineering behind its extended power reserve and operational nuances.

The Parmigianisti are gaining ground π
Now that is a fine beauty! Merry Christmas!
Enjoy your holidays my friend!
I also think the esthetics of it match the movement perfectly.
When I saw the two frequency actuator I assumed the 12:00 sub-dial was the PR indicator, but I always roughly thought the beat frequency was directly proportional to the the power reserve; meaning if the watch beats 4X faster, the power reserve would approximately last 4x shorter, but this appears to last more way longer. Also the Lange 31 is ginormous and this is 65 days!!? And requires a special winding key. Does this? Thanks for sharing.
At 5 Hz it is 4 days, at 1.2 Hz it is 65 days. Powered by twin barrels. The tradeoff is lower accuracy at 1.2 Hz, meaning you will normally need to set the time after prolonged time at 1.2 Hz. Winding is done conventionally via the crown.
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