- Case made of stainless steel, polished
- Captive pilot's bezel with minute ratcheting
- Optionally: Ar-Dehumidifying Technology for enhanced freedom from fogging
- Sapphire crystal glass
- Transparent back made of sapphire crystal glass
- Water-resistant and pressure-resistant to 20 bar
- Low pressure resistant
The pilot watches in Sinn's 103 series make it instantly clear what these timepieces were created for: uncompromising functionality. Following company tradition, the design of these watches reminds one of the instruments in an airplane cockpit.
After all, the first timepieces by the company's founder were mechanical airplane cockpit clocks for professional use. Model 103 St Sa is equipped with a high-domed, scratch-resistance sapphire crystal glass with anti-reflective coating on both sides and has a transparent back made of sapphire crystal glass.
This watch is also available with Ar-Dehumidifying Technology as an option.

Technical details
Self-winding mechanism
25 bearing jewels
28,800 semi-oscillations per hour
Seconds stop function
Anti-magnetic as per DIN 8309
The information on the mechanical movement corresponds to the current production situation in Frankfurt am Main. Due to technical changes, it may happen in individual cases that stock items of our sales partners deviate from this information.
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
Push-pieces screwable
Meet the technical requirements for water-resistance, as set out in standard DIN 8310
Water-resistant and pressure-resistant to 20 bar
Low pressure resistant
Date display
Day of the week display
Chronograph
Pilot’s bezel with minute ratcheting and luminous key mark
Optionally: Ar-Dehumidifying Technology for enhanced freedom from fogging
Band lug width: 20 mm
Case thickness: 17,2 mm
Weight without strap: 88 gramme
Numbers and indices coated with luminescent colour
Hour hand, minute hand and stopwatch second hand coated with luminescent colour