Sinn Spezialuhren 903 St B E

The Sinn 903 St B E, reference 903.045, is a chronograph with a 41 mm steel case water resistant to 100 metres. A dark blue dial carries silver electroplated counters beneath sapphire crystal. Ivory luminous paint marks the hands and indices around the date and small seconds. Self-winding calibre LJP 8000 uses a column-wheel mechanism. The polished and satinised case is 14.5 mm thick with a see-through back. An interior rotating bezel has a logarithmic slide-rule scale. The winding crown has a screw-down construction.