From my personal collection - never worn. Most recently, Cartier has released the striking Cartier SolarBeat watches as a way to showcase its commitment to the watchmaking craft. As part of the brand’s Cartier Tank Must series, the Cartier SolarBeat watches stand out with their sleek designs and high-tech, photovoltaic movements. he Cartier Tank collection has been part of Cartier’s catalogue for more than a hundred years now. In 2021, the brand took a more innovative approach with the Cartier Tank, reworking its design to introduce the new Cartier Tank Must sub-series. The Cartier Tank Must watches consist of a series of new models that are extremely diverse in terms of technology and materials used. One of the more striking models released under the Cartier Tank Must name is the Cartier Tank Must SolarBeat. The Cartier SolarBeat is significant because it manages to preserve the DNA of its predecessors while also integrating new, cutting-edge technology with its photovoltaic watch calibre. This allows the Cartier SolarBeat to absorb sunlight and convert it into energy which can be used to power itself. The Cartier SolarBeat’s solar-based technology is truly a new milestone for the French watch brand. It took two years of hard work and dedication from Cartier’s engineering team to complete the Cartier SolarBeat’s photovoltaic movement, and it is certainly worth it, as this solar-powered unit can last for an impressive 16 years before it needs to be reserviced. These Cartier SolarBeat watches also come with clean silver or white dials, which are furnished with classic blued steel hands and Roman numeral indices. The Cartier SolarBeat is also offered with a number of different strap options. You can select a stainless steel bracelet for a more formal look. This is a strap monster. ​ Asking $3,899 - best price in the USA