903 St HB

Limited to 500 pieces, this navigation chronograph with its beautiful light blue sunburst dial is the perfect introduction to a completely redesigned series. As a whole, it operates at what could be considered a unique technical level. 

At the same time, the functionally designed dial with its fascinating performance characteristics imprints the navigation chronographs in our product range with decades of tradition. For example, the slide rule bezel with its logarithmic scale can be used to calculate times, distances or fuel consumption. Of particular note: We use 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, we achieve a high concentration of the illuminant. The result is extreme brightness and perfect readability in the dark.  

Above all, however, the redesign of the case once again demonstrates our company’s high level of innovation. This case features a silver-electroplated bezel on the inside which can be smoothly operated from the outer diameter of the watch. The watch’s impressive waterproofness of 20 bar in this construction testifies to a feat of engineering that has long distinguished the SINN brand.

The design of a classic navigation chronograph is perfected by the Tri-Compax arrangement of the silver-electroplated counters. The technical highlight of the 903 St HB model is its column wheel chronograph movement, which has a power reserve of at least 60 hours when fully wound. The attachment of the SINN logo as an appliqué is another aesthetically pleasing detail of a consistently sophisticated watch.