Sinn 903 St II A & 903 St II G

The Sinn 903 St II A and 903 St II G expand the navigation chronograph collection with two new colorways: an anthracite and a green electroplated dial. Both versions feature a sunburst decoration and a tricompax layout with galvanically silver-plated subdials. These visual details distinguish the two models while maintaining the functional identity of the 903 series.

The character of these models is defined by a function-rich dial design. Using the slide-rule bezel with a logarithmic scale, calculations for determining time, distance, or currency conversions can be performed with precision. The indices attached by hand, the numeral 12, as well as the hour and minute hands are made of hybrid ceramic luminous elements, providing exceptional luminosity for perfect legibility in the dark.

The tricompax arrangement of the galvanically silver-plated subdials establishes these models as classic navigation chronographs. Inside, a column-wheel chronograph movement performs its task with absolute reliability, driven by a power reserve of at least 60 hours. This LJP L 110 self-winding mechanism operates at 28,800 semi-oscillations per hour and is visible through a transparent sapphire crystal case back.

The navigation scale is controlled by a directly operable rotating bezel. To maintain water resistance for this moving part, Sinn utilizes its proprietary DSP (Dynamic Sealing) Technology. This system ensures the case remains pressure-resistant to 20 bar and meets DIN 8310 standards, allowing for the direct mechanical operation of the scale while remaining protected against the elements.

The 41 mm case is constructed from polished and satinized stainless steel with a thickness of 14.5 mm. The hardware includes a sapphire crystal front with anti-reflective coating on both sides, a screwable crown, and a screw-fastened sapphire crystal case back. Without a strap, the watch has a total weight of 84 grams and is engineered to be resistant to low pressure.

The operational features include hours, minutes, subsidiary seconds, a date display, and full chronograph functions. The SINN logo is included as an applied emblem, bearing witness to the brand's attention to detail and commitment to design clarity. Each watch is provided with a 2-year warranty from the manufacturer, Sinn Spezialuhren.

These models are available on a polished and satinized stainless steel fine-link bracelet, which is secured by a reliable folding clasp. For individual styling, the company also offers an extensive selection of alternative straps, ranging from high-quality leather and durable silicone to versatile textile options. This variety ensures that the navigation chronograph can be adapted to any professional or personal environment.

Sinn 903 St II A

Technical specifications

Sinn 903 St II A

Reference: 903.092

Case

Material: Stainless steel, polished / satinized
Diameter: 41 mm
Thickness: 14.5 mm
Sapphire crystal in front, anti-reflective on both sides
Transparent case back made of sapphire crystal, anti-reflective on the interior
Case back screw-fastened
Crown screwable
Meet the technical requirements for water-resistance, as set out in standard DIN 8310
Water-resistant to 20 bar (~200 meters)

Dial and hands

Anthracite electroplated dial with sunburst decoration
Number “12” and indices made of hybrid ceramic luminous elements, attached by hand
Hour and minute hand made of hybrid ceramic luminous elements

Movement

LJP L 110
Self-winding mechanism
Number of jewels: 26
Frequency: 4 Hz, 28'800 vph
Seconds stop function
Anti-magnetic as per DIN 8309

Functions/Indications

Hours, minutes, subsidiary seconds
Date display
Chronograph
Bezel with logarithmic scale and slide rule function

Strap and buckle

Stainless steel, polished / satinized
Textile straps

MSRP: EUR 3'650 (incl. taxes)

Sinn 903 St II G

Technical specifications

Sinn 903 St II G

Reference: 903.093