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Horological Meandering

Don't forget it is an annual calendar ....

 

.... so you need some kind of month indication when setting the watch. This is the Dubois-Dépraz module known from other brands, as Maurice Lacroix, Nivrel, Ulysse Nardin and of course Richard Mille. C.F. Bucherer uses the module's apex, with flyback, power reserve and retrograde hour counter. All of these variants have the month indication at 4.5.
Marcus

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