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Quick TakeThe Sinn 857 S UTC is a serious bit of kit, not just a pretty face, though its all-black, bead-blasted aesthetic is undeniably striking. This watch screams purpose. The 24-hour hand offers a second timezone. You have got the tegimented steel that scoffs at scratches, the Ar-Dehumidifying tech keeping things clear inside. And the sheer toughness is there with 20-bar water resistance. It is the watch for the individual that values robust engineering. The luminescent hands and indices pop. This watch's SW330-1 movement keeps on ticking, and its anti-magnetic shielding laughs in the face of electronic interference. The captive bezel is built in a manner that is built not just to look good, but to perform. The Sinn 857 is an instrument, a dependable companion for adventures on any continent, at any altitude, in any condition.
DescriptionThe Sinn 857 S UTC, reference 857.020, is a purpose-built instrument watch designed for professional use. At its core, the watch is powered by the SW330-1 self-winding movement. This mechanism features 25 bearing jewels and beats at a frequency of 28,800 semi-oscillations per hour, providing a smooth sweep of the seconds hand, which also contains a stop function. It has anti-magnetic properties, meeting the standards outlined in DIN 8309. This mechanism supports the display of hours, minutes, and seconds, complemented by a date display and a second time zone function presented on a 24-hour scale, that is useful for pilots or frequent travelers.
The exterior begins with a 43mm diameter case constructed from stainless steel, which is known for its durability. The case is surface-hardened with TEGIMENT technology and enhanced with a black hard coating. This provides scratch resistance. The bezel, also made from stainless steel, features a black anodized aluminum insert, with luminous triangle at the 60 min mark. It is a captive bezel, featuring a minute ratcheting mechanism, is bi-directional. The case is sealed with a screw-fastened case back made without TEGIMENT technology and a screwable crown. This aids in it meeting DIN 8310 standards for water resistance. The 857 S UTC has pressure resistant to 20 bar. The front of the watch is protected by sapphire crystal glass with an anti-reflective coating on both sides. Internally, Sinn's Ar-Dehumidifying Technology is incorporated. The dial is a matte black finish. The indices and hands feature a luminescent coating. The watch has a band lug width of 22mm to accommodate the solid stainless-steel bracelet, also finished with the black hard coating. The watch weighs 90 grams without the strap.