Introducing the Romain Gauthier Logical One – reinventing the chain and fusée (live photos and price)

Unveiled for the first time a couple of weeks ago, the Romain Gauthier Logical One is a modern take on the classic chain and fusée mechanism. Alongside the constant force mechanism is a clever crown-less case. And the movement is finished in Romain Gauthier's recognisable style.

The Logical One is Romain Gauthier’s second calibre, and it is equipped with a constant force mechanism of Romain’s own design. Romain’s goal was to implement the constant force mechanism before the centre wheel, referring to a constant torque power source, as opposed to a remontoir at the escapement (which comes after the centre wheel).

Instead of the fusée it has a snail cam. This actually works in the same manner as the fusée, except the chain coils on a single plane around the snail came, instead of upwards around a cone as is the case with a chain and fusée.

The constant force mechanism
The snail cam

According to Romain, the snail cam achieves the same constant torque as the traditional fusée, but enables chain to be shorter, meaning its links can be larger and stronger. And the chain also have ruby inserts in between the links to minimise friction and further increase its longevity.

The front of the watch has a lot going on, all the mechanics of the movement added to the busy sub-dials for the hours and minutes, as well as seconds. I would have preferred more concise sub-dials.

That being said, the layout of the movement is obvious from the front and back. At nine o’clock lies the chain and snail cam, and at one o’clock is the time setting and display gearing.


Romain Gauthier Logical One in rose gold

Directly below the time display is the gear train, and below the balance wheel is the single barrel.

Because this watch has no crown, winding is done by pushing the button in the case at nine o’clock. To get a fully wound barrel, the button needs to be pressed about 40 times.

The time setting button

The time, on the other hand, is set via the button at one o’clock.

The movement has a frosted finish on the flat surfaces, along with prominent, polished bevels. All of the wheels have Romain Gauthier’s signature circular spokes.

The constant force mechanism is secured with a rounded and black polished steel bridge, much like a tourbillon bridge.

Romain Gauthier justifiably takes pride in his movement finishing, and the Logical One demonstrates a new type of bevelling he is using for the first time. The bridge for the gear train, visible on the back, has a stepped, bevelled edge, in effect double anglage.

Most of the movement components are made in-house, including the adjustable mass balance and proprietary escapement.

Though the case is 43 mm, the watch seems smaller, likely due to the relatively wide bezel and lack of crown.

Available in rose gold or platinum, theLogical One is has different movement treatments for each case metal. The platinum is practically monochromatic, while the gilded movement components of rose gold version stand out vividly.

Rose gold

The platinum retails for CHF135,000 while the rose gold is CHF120,000.


NB: The watch pictured is a prototype, hence the roughness of some movement parts, and also the missing power reserve display on the back.

Back to top.

You may also enjoy these.

News: Romain Gauthier Logical One with chain and fusée

Romain Gauthier has just unveiled his second wristwatch model, the Logical One.

Unveiled for the first time a couple of weeks ago, the Romain Gauthier Logical One is a modern take on the classic chain and fusée mechanism. Alongside the constant force mechanism is a clever crown-less case. And the movement is finished in Romain Gauthier's recognisable style.

MB&F launches rose gold HM4 Thunderbolt

Baselworld 2013: Devon Tread 1 Exoskeleton with transparent belts and polycarbonate case


Devon Works has just announced the Tread 1 Exoskeleton, which has a steel and clear polycarbonate case. The Tread 1 Exoskeleton also has a matching steel bracelet, a first for the Tread 1.

An American-made, electronic watch with a mechanical belt display, the Devon Tread 1 has become quite a hit. It even won the Grand Prix d’Horlogerie de Geneve in 2011. The latest iteration of the watch is the Tread 1 Exoskeleton, which is the third version of the Tread 1, after the original and last year’s limited edition Tread 1 Steampunk.

This has a steel case with transparent polycarbonate components – comprising the lugs, horizontal end caps of the case and the crown – along with translucent time belts, exposing the workings of the mechanical parts of the movement.

Alongside the new transparent parts, the Tread 1 Exoskeleton also has a new steel bracelet, which is a first for the Tread 1, which was originally fitted on a rubber strap.

The Tread 1 Exoskeleton is available in steel, or gold-coated steel. The case size remains the same 56 mm by 50 mm. 

Based on discussions with Devon management the retail price will be in the region of US$30,000-35,000.


Back to top.

You may also enjoy these.

Baselworld 2013: Voutilainen V-8R

Devon Works presents the Tread 2

Introducing the Hamilton Jazzmaster Face2face, a Swivelling, Twin-Movement Chronograph

At Baselworld 2013 Hamilton will launch the Hamilton Jazzmaster Face2face, a reversible, double-faced wristwatch. Inside the massive 53 mm by 44 mm oval case are two automatic ETA movements, placed side by side. 

Welcome to the new Watches By SJX.

Subscribe to get the latest articles and reviews delivered to your inbox.