The Megaquartz 2400 ? or f2,4 MHz ? is regarded as the world`s most technically advanced wristwatch. It is precise to less than one second per month, which makes it nearly ten times more accurate than an ordinary quartz watch. This precision stems from a specially-designed tiny disc-shaped resonator, which is sealed in a capsule and vibrates to the rate of 2,359,296 times a second. The title of ?world?s most accurate wristwatch? was bestowed on the watch after 63 days of rigorous testing, resulting in a mean variation rate of no more than 2/1000ths of a second per day, or 0.73 seconds per year. Moreover, the watch is equipped with a time zone and seconds adjustment device. This allows for independent hour adjustment, thus not affecting the minutes or seconds. With the seconds corrector in the band the watch can be set to the exact second according to the official time signal. The Megaquartz 2400 was developed in cooperation with the Battelle Institute of Geneva. The first prototype, using caliber 1510, was presented at the 1970 Basel Fair. The watch was launched two years later in its standard version with caliber 1510 and in 1974 as a marine chronometer, with caliber 1511. Caliber 1511 was launched in 1972 and was produced in only 1000 examples. It is so precise that it was awarded the title of ?Marine Chronometer? from the Astronomic and Chronometric Observatory of Neuchâtel.