The new HYT H1 by HYT Watches, the Hydro Mechanical Horologists, is the first wristwatch ever featuring mechanical and fluid dynamic time indications.
The watch indicates the time by means of two liquids - transparent the first and green the second - that flow through a tube along a peripheral hours scale.
The idea that led to the H1 was simple and consisted of two flexible reservoirs at six o'clock fixed to each end of a capillary. While the first compresses, the second expands, and the other way round, resulting in the movement of the liquid in the capillary.
The repulsive force of the molecules in each liquid keep them separate, with a meniscus to mark the boundary between the two.
As the hours go by, the fluorescent liquid advances. The meniscus, in the shape of a half moon, marks the breaking point with the other fluid in the tube, indicating the time. At 18:00, the fluorescent liquid comes back to its original position, going backwards.
The secret that gets the reservoirs going? Two bellows made of a highly resistant, flexible electro-deposited alloy, each driven by a piston. And this is where watchmaking comes in to activate the system.
The HYT H1 is equipped with an exclusive in-house made mechanical hand-wound movement running at the frequency of 28,800 vibrations per hour.
In the centre of the dial sits the minute regulator, overlapped by a spectacular small seconds display reminiscent of a water wheel. At 02.30, a 65-hour power reserve hand indicates the remaining energy available across three arcs of a circle.
Diameter: 48.8 mm. Thickness: 17.9 mm