Breguet is a watchmaker with a deep obsession for “enhancing timekeeping accuracy,” so almost every year we see new attempts at the core technologies of their movements. The Classique Chronometrie 7727 is one of the most representative examples of their work this year.
The 41mm case fits comfortably on the wrist, and the silver dial is engraved with six different hand-crafted patterns. The subdial at 12 o’clock shows the small seconds, while the power reserve is located at 5 o’clock. On the right side of the small seconds subdial, there is an even smaller 10Hz second dial. If you observe with a loupe, you’ll notice that the blue-steel second hand is also hollowed out.
To achieve the ultimate goal of “precision,” Breguet engineers have incorporated three proprietary technologies into the Cal.574DR movement of the 7727: a 10Hz high frequency, silicon balance spring, and an entirely new magnetic balance system on the ruby axis of the balance wheel.
We saw a 10Hz frequency in their Type XXII chronograph back in 2010, but the 7727 is the first non-chronograph model to adopt a 10Hz frequency. As we know, the higher the frequency, the less timekeeping is affected by external vibrations. However, high frequency also tends to lead to greater energy consumption, which is why the Cal.574DR has two barrels to ensure a 60-hour power reserve.
Silicon balance springs and escapement structures are Breguet’s signature technologies. They are light, anti-magnetic, and durable. You can observe the movement of the blue escapement wheel through the sapphire caseback.
Finally, there’s the new Magnetic Pivot system. In simple terms, this structure places a powerful magnet on either side of the balance wheel axis, with one magnet stronger than the other. This allows the balance wheel to stay in contact with the stronger magnet during normal operation. The weaker magnet helps keep the system in balance. When the watch is impacted, the magnetic field generated by these magnets ensures that the balance wheel returns to its normal state, unaffected by gravity.
As a result, this watch offers timekeeping accuracy of -1/+3 seconds per day, while the Swiss COSC chronometer standard is -4/+6 seconds.
Breguet Classique Chronometrie 7727 Watch
Available in 18K rose gold or white gold, with a 41mm case, sapphire crystal front and back, 18K gold silvered dial, blue steel hands, Cal.574DR manual-winding movement, 45 jewels, silicon balance spring and escapement, 72,000 vibrations per hour, dual barrel, 60-hour power reserve, folding clasp, and 30 meters water resistance.
