The H0 x Eau Rouge, like the rest of the HYT H0 collection, has a proprietary liquid-filled hours display which uses two liquids, one red and one clear, and is pumped in and out by two bellows, which in turn lines up with the chapter ring to show the hour.
Most interesting to me is the prominent box-domed sapphire that covers the entire front side of the watch and also acts as a bezel. From the side view, you can see a 24-hour military time scale that syncs up with the primary hour dial.
These red themed versions (there are currently 6 other versions as well) feature a red fluid for the hours, crown, hands, power indicator and strap. One has a stainless steel finish for the dial and caseback, and the other is in DLC-treated anthracite stainless steel.
Water-resistance is 30 meters. The movement is made for HYT by Chronode. Retail is $39K.
Learn more at HYT.