This automatic sports watch from German watch brand SINN is equipped with a bidirectional rotating bezel with 24-hour ratcheting for setting up a second time zone.
Of course, you can also set the UTC hand in the conventional way using the crown and leave the rotating bezel in its initial position. The arrow-shaped UTC hand can also be used to roughly determine cardinal points, when the current position of the sun is visible. If you’re located in the northern hemisphere, position the dial horizontally and turn the watch so that the 12-hour hand (ignoring daylight savings time) points to the sun. The 24-hour hand then points to the north.
Waterproof and pressure-resistant to 20 bar, this automatic wristwatch has a 41mm diameter case made of stainless steel with bead-blasted finish. It is topped with a sapphire crystal glass. The rotating bezel itself has a captive connection to the bead-blasted case. Its Black Hard Coating on a TEGIMENT Technology basis lends the watch a professional overall look.
The dial of SINN 105 St Sa UTC watch comes in matt black with accents in orange. Both indices and hands are embedded with luminescent coating.
Powering this timepiece is the SW 330-2 self-winding calibre. The details of the mechanical movement are through the anti-reflective transparent case back made from sapphire crystal.
SINN also offers a matt white dial version (105 St Sa UTC W) of this model.
Model: SINN 105 St Sa UTC
• SW 330-2
• Self-winding mechanism
• 25 bearing jewels
• 28,800 semi-oscillations per hour
• Seconds stop function
• Anti-magnetic as per DIN 8309
• Case made of stainless steel, bead-blasted
• Sapphire crystal glass in front, anti-reflective on both sides
• Transparent case back made of sapphire crystal glass, anti-reflective on the interior
• Case back screw-fastened
• Crown screwable
• Meet the technical requirements for waterproofness, as set out in standard DIN 8310
• Waterproof and pressure-resistant to 20 bar
• Low pressure resistant
• Hours, minutes, seconds
• Date display
• Rotating bezel with 24-hour ratcheting
• Second time zone on a 24-hour basis
• Bezel with Black Hard Coating on a TEGIMENT Technology basis
• Captive bezel
Dimensions and weight
• Case diameter: 41 mm
• Band lug width: 20 mm
• Case thickness: 11.9 mm
• Weight without strap: 73 gramme
Dial and hands
• Matt black dial
• Indices coated with luminescent colour
• Hour, minute and second hand coated with luminescent colour
• 2 years