The Sinn 856 has become a favorite for those seeking a dual time zone watch.
This watch features "Tegiment" technology. Standard steel used by most watch companies has a hardness of between 200 and 240 HV (Hardness Vickers is a common scale used to measure material hardness). The Tegiment layer has a hardness of 1,200 Vickers which is up to five times harder than standard steel.
The Tegiment layer is not a coating consisting of a foreign material, instead the steel itself that has been hardened using a special engineering process that creates a hardened barrier. The base material is a type of stainless steel also used for surgical implants, and the stainless steel resistance to corrosion is even further improved by the Tegiment hardening process.
Next, this case offers magnetic field protection of up to 80,000 A/m, among the highest for any mechanical watch. The case back is nickel free offering protection to those with allergic reactions to this metal.
And for those that don't encounter magnetic fields on a regular basis, it's just a great watch to wear every day.
The case features a copper sulphate capsule which reacts with moisture to diffuse and absorb humidity in the watch.
A small yellow hand indicates the second time zone on a small 24-hour scale.
Sand-blasted stainless steel case with solid back. Dial is matte black with Arabic numerals and offset date display at 4. The design and layout of this watch make it extremely easy to read in virtually all light conditions.
Sapphire crystal with luminous hands and hour markers. Watch is water resistant to 20 ATM. Steel Tegimented bracelet.
Other features include Sinn's Dehumidifcation Technology
which uses inert gas to reduce humidity and to prevent the dial from fogging.