Arnold & Son - Arnold & Son, Constant Force Tourbillon 1FCAR.B01A.C112C
Arnold & Son - Arnold & Son, Constant Force Tourbillon 1FCAR.B01A.C112C

Arnold & Son, Constant Force Tourbillon 1FCAR.B01A.C112C

Arnold & Son | 215'200 € Tax inc.

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Arnold & Son, Constant Force Tourbillon


The Constant Force Tourbillon from Arnold and Son (A&S), part of the Swiss watchmaking manufacture’s ‘Royal Collection’ series of watches, is a watch that places precision as its purpose. As you would expect from a watchmaker with the heritage of Arnold and Son and the capacity to design and manufacture in-house in Switzerland some of the world’s most technically advanced and painstakingly hand-finished mechanical movements in the world today, the resulting Constant Force Tourbillon watch is indeed an exemplary chronometer. In a world that is awash with popular watches of high quality (though not all of them with in-house movements), such as the Royal Oak of Audemars Piguet, Patek Phillipe chronographs, and from TAG Heuer Carrera to the output from Franck Muller, Ulysse Nardin and Christophe Claret, the Constant-Force Tourbillon from Arnold and Son offers something genuinely very different in exquisite watches in an already outstanding Royal Collection, that sit alongside A&S watches in the Instrument and other collections.

The aim of this perpetual chronometer is to place it beyond compare, with every detail of the device, from its 18 carat red gold case, very special mainspring design, simple dial display of hours, minutes and seconds, to its wonderful constant force mechanism, able to add that little extra something that will almost certainly make you want to add the watch to your wishlist or collection, and is available for shipping immediately at a modest price. Like all the watches in the Royal and Instrument Collections from Arnold & Son brand Watches of Switzerland, the Constant-Force Tourbillon is a limited edition chronometer offers all the history and royal association of vintage Arnold & Son timepieces from the past, and is not merely a way of discerning the hours, minutes and seconds of time.

John Arnold, original founder of Arnold & Son in England in the late Eighteenth Century, clock and watchmaker for not only to Royal families but the Royal Navy, a long list of HMS and private vessels dedicated his life’s work not only to the production of exquisitely finished timepieces, but the search for accuracy in the mechanism: accuracy, the complex function of the mainspring and other elements, would provide both John Arnold and his son John Roger Arnold, with timepieces better able to calculate longitude at sea, and the ships that sailed with them, naturally an advantage. John Arnold and his son were of course, not the only ones interested in accuracy, and special mention should be made of their close friend, Abraham Louis Breguet, who apprenticed Arnold’s son in his workshops, and developed and patented the tourbillon: an attempt principally  to isolate the delicate workings of the movement from the effects of gravity by enclosing the regulating heart of the watch, balance, balance spring and escapement in its own tiny, rotating cage. As well as being a beautiful additional complication to any watch today, the work of Greubel Forsey has demonstrated that today’s tourbillon complications may offer significant gains in accuracy, as well as their undoubted aesthetic appeal, and all at a price, including shipping where required, that may surprise you.

The Constant Force Tourbillon from Arnold and Son once again places accuracy centre-stage, and it should be of no surprise that in conjunction with all those elements typical of Arnold and Son Haute Horlogerie, including beautiful symmetry and stunning hand-finishing, that the Constant-Force Tourbillon from Arnold and Son would include a tourbillon. Other complications would, however, also be needed if this watch was to achieve its aim of the very highest accuracy over the entire length of the watch’s power reserve, a dead beat second hand (a True Beat Second), a double barrel, and a ‘Constant Force Device’, all set within an astoundingly well-balanced movement.

To achieve the aim of superlative accuracy the in-house design team at Arnold and Son Switzerland has incorporated all these elements into the A&S 18 carat red gold case Constant-Force Tourbillon. Starting with the watch’s power-providing mainspring, the decision was made to adopt a double barrel, two mainsprings working in series, one mainspring after the other, rather than in parallel, one after the, thus minimizing the total torque load on the mainspring and thus force on the movement, and at the same time offering the benefits of the smoother, and thus more constant, force available from smaller rather than larger mainsprings. The Constant Force Device itself consists of a winding mechanism: a small spring which receives the input force from the mainspring and then sends this energy into the chronometer’s one-minute tourbillon escapement, once every second.

The force of power received at the one-minute tourbillon will therefore always remain the same, irrespective of the torque force from the dual mainspring design, and no matter their state of winding. Very careful attention was nonetheless paid to the design of the Constant-Force Tourbillon’s tourbillon escapement, with the balance utilizing double arches rather than a full metallic circle, saving weight and further adding to balance. With the escapement receiving motive force to pass on to the second hand once every second, the logical conclusion was to add a further complication, principally to aid the precision available in viewing the time itself, in the form of the dead-beat seconds or true beat seconds second hand, which is able to resolutely mark each individual second as it passes thanks in no small part to the intermittent force provided by the winding mechanism. Genius. The Constant Force Mechanism, true beat seconds and one-minute tourbillon have been integrated into the design of the watch seamlessly, providing a clear, clean (and highly symmetrical) display when viewed dial-side. Hours and minutes are displayed very cleanly, the hour and minute hands mirroring the effect of the red gold case, and making it very easy to read the time on the dial. The movement is housed with a 46mm red gold case that features anti-reflective sapphire crystal and a fully transparent sapphire crystal display back. From the display side, two pairs of palladium treated bridges support the dual barrels on the upper half of the watch, and rotating Constant Force Mechanism and one-minute Tourbillon mechanisms showcased neatly below. The watch’s main plate is adorned with grey NAC treatment in addition to classic Haute Horlogerie flourishes: hand chamfering to the bridges with polished edges and brushed surfaces, screwed gold chatons and bevelled and mirror polished screws.

The tourbillon itself receives almost exactly the same minute attention to detail, the cage mirror polished with hand chamfered and polished edges and circular satin-finished surfaces. As you would expect from a brand with the history of Arnold & Son, power reserve in this manual wind is exceptional, and not limited in any way. 

Technical specifications




- 18 carat red gold case

- Diameter 46 mm

- Cambered sapphire with anti-reflective coating on both sides

- See-through sapphire case back



- Hours & Minutes

- True Beat Seconds

- Tourbillon, Constant Force



- Caliber A&S5119

- Exclusive Arnold & Son Mechanical movement, hand-wound,

- 39 jewels

- Diameter 36.8 mm

- Thickness 6 mm

- Power reserve : 90h

- Double barrel

- 21,600 vibrations/h.



- Nickel-silver and steel movement

- Palladium treated bridges and NAC grey treated main plate with Haute Horlogerie finishing : 

- Hand-chamfered bridges with polished edges and brushed surfaces,                       

- Screwed gold chatons,

- Screws with bevelled and mirror-polished head. 

- Tourbillon cage: mirror-polished with hand-chamfered polished edges and circular satin-finished surfaces.



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