An unusual execution of a perpetual calendar, unique in its intricacies and historically never executed in this way before, technically or aesthetically.
(QP = French, Quantium Perpetual - English, perpetual calendar).
Made by MB&F and independent watchmaker Stephen McDonnell. With 581-components. Below are three watches of the same model; a fully assembled and cased example. Secondly, components from a kit for a movement yet to be assembled with a different colour mainplate. Lastly a semi complete movement, advanced, shown with and with out subsidiary dials.
One of the characteristics with this Perpetual Calendar that differentiates it from other conventional examples which are decorated as this one, predominantly by hand and made in small numbers, is the adjustment required after assembly. Normally with QP's there is a considerable amount of time consumed to assure the mechanism functions correctly. Here the watch is assembled and works with little to no adjustment.
A perpetual calendar automatically adjusts to the variable length of each month and leap year.
QP's tend to be made as slim as possible to reduce the thickness of the final watch. Here the Qp is fully visible and some of the components are made on multiple layers emphasizing the horological nature of the construction producing a substantial piece of 3 dimensional horology.
Recto-verso of the complete movement.
Precision time keeping, 6 positions under 10 seconds daily variation.
Individual assemblies and components
The movement has been produced with every form of CNC machining available, ranging from conventional milling to electro-formage. The decoration is consistency made by hand as normally seen in high-end complications made in small numbers. The domed sapphire allows both the balance and perpetual calendar to be highlighted. It is rare today to find a fully integrated Quanitieme Perpetual timepiece, the majority manufactured are produced in modular form and added to existing calibres. The result is both technically and aesthetically beautifully executed.
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