Sinn watch 903 st b e alligator a unique breed of a vintage navigation chronograph the sinn 903 st b e is purposeful to those who adore timepieces with performing analogue calculations the dark blue dial is the perfect companion for the ivory embellished indices and hands which have been treated with a luminous coating with remarkable attention to detail and a bold injection of colour the timepiece is a credit to the highly skilled design engineers courtesy of the sinn watch company the a