857 S UTC Flieger Steel Watch

Series 857: pilot watches with magnetic field protection.

The Watch
Topped by a flat sapphire crystal with double anti-reflective coating, the round case is crafted in stainless steel with black PVD coating. It measures 43 mm in diameter, 12 mm thick, and weighs 90 grams without the bracelet. The black dial features luminescent hands, Arabic numerals, and white indices that glow in the dark, along with a date window at 4 o'clock. A 4th^e hand displays a second time zone in 24h mode. The caseback is screwed down and guaranteed nickel-free. The crown at 3 o'clock is also screwed down.

The case features a black bidirectional rotating bezel that provides a visual countdown function. To prevent accidental rotation, the bezel is secured to the case in a way that ensures it cannot be lost.

This watch features a steel bracelet with black PVD coating and a deployment clasp. The model is rated to 20 atmospheres, equivalent to approximately 200 meters. It is suitable for swimming and scuba diving.

Specific Technical Features
The case, bezel, and entire bracelet have undergone TEGIMENT anti-impact treatment. This surface-hardening technology provides highly effective protection against scratches on stainless steel.

This watch also features Sinn's patented Ar dehumidification technology. This technology slows down the aging process of the watch's internal components, extending the movement's service life. It also prevents condensation from forming on the crystal during sudden temperature changes.

It also offers protection against magnetic fields up to 80,000 A/m, thanks to a dial and caseback made of soft magnetic material. This construction prevents the watch from being disrupted or stopped when exposed to magnetic fields generated by, for example, electric motors or loudspeakers.

The Movement
This watch houses a Swiss Sellita SW330-1 automatic movement. This 21-jewel caliber displays hours, minutes, seconds, and the date in a window. It also features a second time zone display in 24h mode. Equipped with a hacking seconds mechanism for precise time-setting to the second. This movement runs at 28,800 A/h with a 42-hour power reserve.