The 903 series is presented in a version that has been technically completely redesigned. Visually recognisable, the navigation chronograph 903 St II is available as a standard model with an electroplated black dial with sunburst decoration and has been elevated to an unparalleled technical level. The functionally designed dial imprints the navigation chronograph in our product range with decades of tradition. For example, the slide rule bezel with a logarithmic scale can be used to calculate times, distances or fuel consumption. Of particular note is the use of hybrid ceramic luminous elements in the indices, which are meticulously attached by hand, the number 12 and the hour and minute hands. By integrating the illuminating pigments into the respective hybrid ceramic moulded part, a high concentration of illuminant is achieved, resulting in extreme light intensity and perfect readability in the dark.

However, the redesign of the case of the 903 St II, in particular, once again demonstrates our company's high level of innovation. This case features a silver-electroplated bezel which can be smoothly operated from the outer diameter of the watch. The impressive water resistance of 20 bar testifies to a feat of engineering that has long shaped the SINN brand. The Tri-Compax arrangement of the silver-electroplated counters completes the classic navigation chronograph's design. The crowning glory of this model is its column wheel chronograph movement, which has a power reserve of at least 60 hours when fully wound. Watch connoisseurs will immediately recognise that the SINN logo as an appliqué is another fine detail of a consistently sophisticated watch.

Technical details

Mechanical Movement

LJP L110
Self-winding mechanism
26 bearing jewels
28,800 semi-oscillations per hour
Seconds stop function
Anti-magnetic as per DIN 8309

Case

Case made of stainless steel, polished / brushed
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
Winding 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 a logarithmic scale and slide rule function

Dimensions and Weight

Case diameter: 41mm
Band lug width: 22mm
Case thickness: 14.5mm
Weight without strap: 84g

Dial and Hands

Black electroplated dial with decorative sunburst
Number “12” and indices made of hybrid ceramic luminous elements, meticulously attached by hand
Hour and minute hand-made of hybrid ceramic luminous elements

Warranty

2 years

About Sinn

Sinn Watches was founded in 1961 and has long been a big name in horology. The brand was originally focused on producing navigation clocks for cockpits, and this design is reflected in their collection of pilot watches decades later. Sinn promises uncompromising functionality in their watch collections, even in the most demanding conditions. Thanks to industry leading technologies such as Ar-Dehumidifying and antimagnetic construction, Tegiment steel hardening and temperature stabilized movements. It’s not surprising then, that Sinn is praised for their high-quality movements and materials and loved by collectors for their accuracy in extremely adverse conditions.

Sinn 903 St B E II Navigation Chronograph - Steel Bracelet - Blue Dial

Sinn 903 St II Navigation Chronograph - Steel Bracelet - Black Dial