- Case made of stainless steel, polished
- Pilot's bezel
- Shock-resistant acrylic glass (sapphire crystal glass optional)
- Solid back (transparent back made of sapphire crystal optional)
- Water-resistant and pressure-resistant to 20 bar
- Low pressure resistant
The models 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, which is equipped with a shock-resistant acrylic glass, is also available for an extra charge with a high-domed, scratch-resistance sapphire crystal glass with anti-reflective coating on both sides.

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.
Acrylic glass in front
Case back screw-fastened
Crown 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 luminous key mark
Band lug width: 20 mm
Case thickness: 15,9 mm
Weight without strap: 74 gramme
Numbers and indices coated with luminescent colour
Hour hand, minute hand and stopwatch second hand coated with luminescent colour