At SIHH 2014, Cartier presented a number of?new pieces that were highly?impressive from a technical point of view-and one?of my personal favorites that follows that heritage in its own interesting way is the Cartier Rotonde?de Cartier Tourbillon Chronograph.?With SIHH 2015?coming up soon,?it is a good time to revisit this piece and perhaps prepare ourselves a little bit as to what we are likely going to see from the brand in the upcoming year.For the last couple of years, Cartier has stepped up its game and started to equip its watches with in-house manufactured movements. Its venture into the world of proprietary movements started with super complicated calibers-like the Astrotourbillon Carbon Crystal?or the ID and ID2 watches. Those were followed up by a number of-relatively speaking?C more?accessible watches?including those equipped with chronograph or simple date calibers. The Rotonde de Cartier Tourbillon Chronograph serves as a bridge between the manufactures?ultra high-end-and basically unobtainable-haute horlogerie pieces and its more regular collections. Lets see how this blend works out. The Rotonde de Cartier Tourbillon Chronograph does what it says on the cover: its hand-wound movement offers a one-minute tourbillon exposed at the 9 oclock position of the dial, a 30-minute chronograph counter at 3, and a most?welcome?power reserve indicator?at 6, to help keep track of the movements impressive eight days worth of power reserve. Despite that impressive-albeit nothing groundbreaking-list of features, the movement?inside this piece is interesting for another reason.It sports a refreshingly?unique layout for a hand-wound chronograph, thanks to the large Cartier-marked bridge that secures some of the chronographs wheels, and?the busy arrangement of?highly polished cams, levers, and of course a column wheel in the lower left segment of the?case back. Beyond the layout of components, what renders this caliber 9438 MC more unique is?the fact that it actually is not a movement designed and manufactured in-house by Cartier, but something they sourced from APRP (Audemars Piguet Renaud Papi, whom we visited not long ago).Comprising 318 parts, the movement is 34.6 millimeters wide and 8.15 millimeters thick and runs at 3 Hertz (21,600 vibrations per hour). The hefty?movement makes for an even larger case: 45 millimeters in diameter and 16.4 in thickness, the?Rotonde de Cartier style case is as massive as it has ever been. By contrast, the Rotonde de Cartier small complication (debuted here) with a date and power reserve is 8.94 millimeters thick-fully cased. Done in 18k pink gold and featuring the?trademark Cartier cabochon?set into the crown, the Rotonde de Cartier Tourbillon Chronograph?certainly isnt the most agile-looking iteration of the Rotonde-but that is the price to pay for such mechanical complexity and extensive power reserve. A mono-chromatic dial,?fired up with blued hands and the splash of gold?exposed?in the opening at 9, lends?a rather serious look to this piece. Thanks to?the relatively small diameter of the movement the sub-dials sit quite close to one another, allowing for the use of bold Roman numerals all around the dial. Given?the compact size of the 9438 caliber, one might?wonder why the 45 millimeter wide, chunky case was necessary-a smaller case would make the sub-dials at least appear to be further apart, and?the watch itself would be one of the relatively few highly complicated watches with a smaller case size.A?simple?answer to that question is related to thickness. Watch brands?try and?achieve an acceptable ratio between width and thickness-a small but thick watch?actually wears a lot worse than one with a bit more added to its diameter.The Cartier Rotonde de Cartier?Tourbillon Chronograph?unquestionably is a niche offering-interestingly, it is also?unusual within the collection, bearing a sourced movement, that is not entirely in line with Cartiers direction as far as in-house?movements are concerned. Nevertheless, it is nice to see major manufactures?with plenty of resources invested into?proprietary calibers?harness the know-how?of external specialists-as often times?they are the ones who?surprise us with the genuinely interesting stuff, by giving work to the crazy horological scientists, working behind the scenes. A shining example of whom is?Carole Forestier-Kasapi, the head of fine watchmaking at Cartier,?and a watchmaking mastermind who worked with APRP at an early stage of her carrier.?Limited to just fifty pieces, the Cartier Rotonde de Cartier?Tourbillon is priced at 135,000 Euros or around $163,000. cartier.com [...]