Sinn 903 H4

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File:Sinn 903 H4.jpg
Sinn 903 H4

903 H4 is a navigation chronograph by Sinn.

Unlike the other navigation chronographs of Sinn (Sinn 903 St), which are provided with self-winding movement, this model operates in the classic way with manual winding. Thereby via glass bottom an unobstructed view of the movement opens up, because no rotor prevents the free view.

As manual winding movement the rare 1883 by Lemania is used. The watch offers a hands date and also a moon phase indication.


Manual winding chronograph movement Lemania 1883, 21,600 A/h
18 jewels
Shock proof according to DIN 8308
Anti-magnetic according to DIN 8309


Stainless steel, DIN material No. 1.4435, polished/satin-finished
Ø 41 mm, height 13.4 mm
Top glass: high-domed sapphire crystal, with anti-glare treatment on both sides
Caseback screwed, with sapphire crystal glass, with anti-glare treatment on the inside
Integrated rotating bezel with logarithmic scale division, bidirectional rotating via crown at 8 o'clock
Crowns with double O-ring seal, unverschraubbar
Waterproof to 100 m, low pressure resistant


Hours, minutes, small seconds with hacking seconds
Hands date and moon phase at 12 o'clock, quick correction by two pushers at 10 o'clock
Chronograph: hours (at 6 o'clock) and minutes (at 3 o'clock) in totalisers, central seconds, stop time max. 12 hours
Slide rule function


Anthracite mat galvanised dial
Counters black glossy galvanised, hour indexes coated with special long-lasting, luminous paint, UV-resistant


Leather strap with tang-type buckle and solid stainless steel bracelet inclusive


2 years