Sinn Spezialuhren 303 M-kmh

The Sinn 303 M-kmh, reference 303.040, is a chronograph with a polished 41 mm steel case. Its model railway tachymeter scale is calibrated in kilometres per hour. A sapphire crystal fronts the matt black dial with small seconds and weekday display. The case measures 17 mm thick with a see-through back, water resistant to 200 metres. Self-winding calibre Valjoux 7750 has shock-resistant construction. A conversion table on the back shows kilometre-per-hour and mile-per-hour scales. Luminous hour markers surround the dial and its date window.