Forty millimeters, at a time when everything else F.P. Journe made measured thirty-eight. That is the first thing to know about the Ruthenium Tourbillon Souverain, and it is the reason the series looks different from the watches around it. Journe built ninety-nine of each of five models between 2001 and 2005, treated their dials and their movement plates with ruthenium, and put the tourbillon in a platinum case two millimeters larger than the standard. The dial is ruthenium applied over gold with whitened guilloche silver. The movement is the calibre 1498, hand wound, a tourbillon carrying a constant force device, with the hours and minutes at 3 o'clock and the power reserve indication at 10. Ninety-nine were made and none since, and the series has never been revisited in any form.
Two millimeters does not sound like a decision worth discussing, and in 2001 it certainly was one. The Tourbillon Souverain had launched in 1999 at 38 mm, which was the size a serious complicated watch measured at the time, and every early F.P. Journe was built to it. Going to 40 for the Ruthenium series was the first time the manufacture made anything larger, and it happened on a limited run rather than in the main collection, which is the conservative way to try something. The extra diameter does real and visible work on this particular dial. A tourbillon carriage needs a fixed amount of room and the hours and minutes have to go somewhere else, so the 38 mm version is a genuinely tight composition with the subdial pushed hard against the edge. At 40 the same layout breathes. Journe went on to build at 40 mm and then at 42 across most of the catalog, and the industry moved with him, but this is where it started, and it started as an experiment carried out inside a numbered series rather than as a change to the collection proper. That is worth noticing about how the manufacture works: the risky decisions get tested on runs of ninety-nine before they reach anybody else.
The calibre 1498 is the original tourbillon movement and its specification explains what kind of watch this is. It measures 32.40 mm across and 6.60 mm high, carries 28 jewels across 191 components, runs at 21,600 alternations per hour, and holds 42 hours from a full wind of twenty turns of the crown. The constant force device is the reason it exists in this form. A mainspring gives up more torque when it is full than when it is nearly spent, so Journe put a remontoire between the barrel and the escapement, a secondary spring rewound at fixed intervals that delivers an identical impulse regardless of what the mainspring behind it is doing. Building that inside a rotating tourbillon carriage, which is already carrying the escapement and the balance and has to remain light enough to keep turning, is the genuinely hard part of the watch. Ruthenium then went onto the plates as well as the dial, so the whole thing is visible through the back in the same dark treatment, and the movement reads considerably colder than a plated brass calibre of the period otherwise would. Forty-two hours is short by any modern standard and entirely normal for a tourbillon of this kind, since the carriage is a continuous drain on the barrel and the remontoire takes its share as well.
The Ruthenium series sits at the end of something rather than at the beginning of it. The calibre 1498 ran from 1999 until 2003, which makes it a four-year movement in total, and the tourbillon that followed it carried a noticeably different specification, with the power reserve moved round to 12 and a dead beat seconds added at 6. The Ruthenium tourbillon therefore belongs squarely to the first generation, and to a manufacture that was barely two years old when the series was conceived and had built its entire reputation on this one watch. Journe was still working in plated brass at that point; within a couple of years he had moved the entire catalog over to solid gold plates, and the ruthenium treatment as applied to a brass movement became impossible to repeat on anything built afterward. Ninety-nine watches inside a four-year window, built on a movement that was subsequently replaced, in a surface treatment that could not be carried forward. Very little in modern watchmaking closes off that cleanly, and it is the main reason the series is followed piece by piece rather than as a category. The tourbillon is the one most collectors want, because it is the model the manufacture was built on.
The two ruthenium treatments are what define this watch, so verify each of them separately. The ruthenium must be present on the dial and on the movement plates alike, and an example carrying the treatment in only one of those two places is not a Ruthenium series piece, whatever else it may turn out to be. Look across the dial in good light for wear through the layer, which cannot be reapplied to match and is the characteristic failure here. Establish the series number and confirm it against the original documentation, since these watches are tracked individually by the people who collect them and an unnumbered example raises questions that are difficult to answer afterward. Then wind it fully and let it run down over its forty-two hours, confirming the reserve indication at 10 tracks the descent properly. Have the carriage examined by somebody equipped to do it, because a constant force device inside a rotating cage is not a mechanism anybody should take on trust from a photograph. Ask what service work has been carried out and by whom, and treat a vague answer as a problem.
