Sinn 903 St

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File:Sinn 903 St Silber.jpg
Sinn 903 St Silver

903 St, 903 St Black and 903 St Silver are chronographs by Sinn.

Sinn calls this series "Automatic Navigation Chronographs". The peculiarity of the models with the proven automatic chronograph movement Valjoux 7750 lies in the integrated bezel with logarithmic scale division (slide rule function), as it is also known from the Breitling Navitimer.

In addition, the extremely elaborate preparation of the dials impresses. In pure manufacture working in a first of more than 30 operations the surface is finished with a solar grinding (with the black dial variant), as basis for the satin finish. In order to ensure the desired, extremely durable UV resistance, then each dial is also dyed by hand in silver or black with an electrolytic plating method. The result is not only an extremely high-quality appearance with deep, rich luster, but above all absolute color authenticity is guaranteed for many years - and with it a permanent certainty of best readability.


Mechanical chronograph movement Valjoux 7750, 28,800 A/h
28 jewels
All brass parts rhodinated, movement parts with perlage, rotor with Geneva stripes, blued screws
Nivarox 1 hairspring, Glucydur balance wheel, Berylium plateau
Mainspring Nivaflex 1, Incabloc shock protection
Shock proof according to DIN 8308
Anti-magnetic according to DIN 8309


Stainless steel, DIN material number 1.4435, polished/satin-finished
D 41 mm, H 14.5 mm
Sapphire crystal and sapphire crystal caseback, with anti-glare treatment on both sides
Integrated rotating bezel with logarithmic scale
Screw-in crown
Waterproof to 100 m, low pressure resistant


Hours, minutes, small seconds with hacking seconds
Date at 4 o'clock 30 minutes
Chronograph: 12 hours counter, 30 minutes counter, 60 seconds counter
Slide rule function


Black bzw. silver dial, galvanised with black nickel or silver nickel coating
Totalisers milled with diamond planing
Hands, number 12 and indexes with luminous coating


Black leather strap with tang-type buckle in polished stainless steel
Optionally available with solid polished gracefully built / satin-finished stainless steel bracelet with milled butterfly clasp, band members for length variation


2 years