While even the best mechanical watches won’t be as accurate as quartz, some incredibly good ones are worth mentioning. It takes about three months before they go in to select only the most stable crystals for their 9Fs. In fact, Grand Seiko grows and develops their very own quartz crystals. Grand Seiko’s 9F quartz movement adjusts for temperature variations, ensuring an accuracy of plus or minus ten seconds a year. This makes it one of the most accurate Swiss quartz watches in history.Ī paramount quality in a watch movement is how well its accuracy can stand up to outside forces, like temperature and impact. Its quartz movement is accurate at plus or minus five seconds a year, just like the Citizen Chronomaster. The Longines Conquest Very High Precision, or VPH for short, debuted at 2017 Baselworld. Their legendary Lunar Pilot is a good example. Bulova’s high-frequency quartz movement, which to this day is still eight times greater than the typical quartz movement, can still be found in their iconic watches. Then, decades later, Bulova’s Precisionist would boast an accuracy of 10 seconds a year. Naturally, this watch would be called the Accutron. This new tuning fork movement, Caliber 214, resulted in the most accurate movement ever at the time, with a deviation of a minute per month. In 1959, they released a movement in which a tuning fork was positioned between transistors. It runs on the A660H quartz caliber and has an accuracy of minus or plus five seconds a year, which is more than accurate enough for most of us.īulova is another brand associated with highly accurate quartz calibers. This was the beginning of the quartz revolution, or the quartz crisis, as many Swiss heritage brands dubbed it.Ĭitizen’s CTQ57-0953 Chronomaster is often considered one of the best quartz movements outside the atomic timekeeping realm. The Astron raised the bar on accuracy and reliability, throwing the mechanical watch industry into a tailspin. Seiko released the first commercially available, mass-produced quartz watch in 1969. Think of the vibrations of the crystal as the equivalent of a pendulum on a grandfather clock. Since quartz movements keep time using a crystal oscillator, the higher the frequency, the more accurate the calibration. Meanwhile, the Seiko SBXC109 Astron and the Casio WVAM640D are two examples of radio-controlled atomic timekeepers. One example of an atomic clock is NASA’s Deep Space Atomic Clock. It’s difficult to be more accurate than a deviation of one second per 100 million years. Most Accurate Quartz Watch MovementĪgain, the gold standard for watch accuracy is atomic watch quartz movements. Let’s dig a little deeper, starting with quartz accuracy. Master Chronometers that meet METAS standards are even better, with a potential deviation of more than five seconds a day. Those with COSC certifications, otherwise known as Chronometers, are some of the best. However, there are highly accurate mechanicals out there. A mechanical can deviate a few minutes per month. A run-of-the-mill quartz watch deviates from minus 10 seconds to 20 seconds a month. In general, quartz watches are more accurate than mechanicals. The time is set with radio waves from an atomic clock, which is accurate within one second every 100 million years.Ītomic clocks use atom vibrations to keep time, and atomic watches are quartz-powered. Quartz-focused brands like Casio and Seiko have models with such movements. Right off the bat, I should clarify that the most accurate watch movement is one that’s synced to an atomic clock. What Are the Most Accurate Watch Movements?
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