The G-02 movement performs "one operation per second," which accounts for the watches' One Hertz name. The watch actually runs at a 2.5 hertz rate which I think is 21,600 bpm. So how does the second hand move only one place each second? Well it is really complex actually. Most watches like this have some type of constant force escapement, but the G-02 does not. It has a complex system of two mainspring barrels that work together to tell the time. Each mainspring barrel has its own gear train, but they are connected to work in unison. So one works to move the seconds hand, and another moves the hours and minutes. Not totally sure though how the seconds operate so slowly (most mechanical watches have the seconds hand tick rapidly at 5-10 times per seconds to make it look like it is sweeping), but here the seconds hand ticks just once per a second. The only true sweeping seconds hand is on a Seiko Spring Drive watch (as far as I know) - though perhaps on a tuning fork movement (I just don't know enough about those). Anyhow, Gronefeld worked to ensure that friction was really low in the movement to promote accuracy.
Set in a steel case with a nice polished black stone cabochon in the crown, this is a Cartier watch all the way through. The bezel visually integrates into the sloped flange chapter ring right under the sapphire crystal. The steel on steel look is nice, but makes the dial look pretty small. Which it is. A design experiment if anything. Makes for a petite look that is mostly popular with women these days, but still has qualities that many like. The bezel with its classic looking Roman numerals is a little hint that our friend here isn't a pure sports watch. Cartier DNA is still dominant. I love the use of the repeating Cartier 'double C' logo on the dial. Hour markers are applied and covered with SuperLumiNova. Aside from it being small, the sporty looking dial is quite legible. Note the magnification lens over the date window, and that the date disc is black with lighter colored numerals (you know I love that look). Cartier did the same thing on the newer, Roadster S watches (that I reviewed here).Read more ›