Sinn 903 St II A

One new colour world, one technical masterpiece: the navigation chronograph 903 St II A exemplify the continued evolution of a highly functional model range. The distinction lies in the visual details. The 903 St II A with its anthracite-coloured dial impresses with its refined elegance.

The character of the 903 St II A is defined by their function-rich dial design. Using the slide-rule bezel with 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 bezel, operated directly by sliding along its outer diameter, demonstrates a level of engineering precision that is second to none. That the watch achieves water resistance up to 20 bar thanks to DSP Technology underscores our decades of technical expertise.

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.

The 903 St II A thus strikingly demonstrates how functional excellence and technical sophistication merge into a clear, purposeful design. The SINN logo as an applied emblem once again bears witness to the brand’s attention to detail and its uncompromising commitment to design clarity.

Anthracite electroplated dial, with sunburst decoration
Case made of stainless steel, polished/satinised
DSP Technology – dynamic sealing up to 20 bar for directly operable rotating bezels with inner scale
Bezel with logarithmic scale and slide rule function
Column wheel chronograph, exquisitely decorated
Hybrid ceramic luminous elements, attached by hand
Crystal and transparent case back made of sapphire crystal
Water-resistant and pressure-resistant to 20 bar
Low pressure resistant

Mechanical Movement

LJP L 110
Self-winding mechanism
26 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.

Case

Case made of stainless steel, polished / satinized
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 and pressure-resistant to 20 bar
Low pressure resistant

Functions

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

SINN Technologies

DSP Technology – dynamic sealing up to 20 bar for directly operable rotating bezels with inner scale

Dimensions and Weight

Case diameter: 41 mm
Band lug width: 22 mm
Case thickness: 14,5 mm
Weight without strap: 84 gramme

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