- Case made of stainless steel, polished / satinized
- Lemania 1883 mechanical hand-wound movement
- Moon phase display
- Hand date
- Interior bezel with logarithmic scale and slide rule function
- Sapphire crystal glass
- Transparent case back made of sapphire crystal glass
- Charcoal grey electroplated dial, UV resistant
- Pressure-resistant to 10 bar
- Low pressure resistant
Shipping costs, taxes and customs duties
New watch deliveries are free of shipping costs within Germany. For delivery to European Union (EU) Member States, we charge EUR 80.00 and for deliveries to all other countries we charge EUR 120.00 shipping costs. For bracelets and accessories we charge EUR 6.50 within Germany, EUR 30.00 to European Union (EU) Member States and EUR 50.00 to all other countries.
Shipping costs for service and spare parts can be found in the service price list.
For deliveries within the European Union (EU), the VAT rate of the supplier country is charged. Deliveries outside the EU are shipped VAT-free.
For deliveries outside the EU, additional customs duties and fees may apply. Please check the relevant customs regulations with the respective customs authorities.
For many watch lovers, the use of a hand-wound movement represents the purest form of a mechanical watch. No rotor impedes the view of the movement. Regularly winding becomes a personal ritual. For those who are fascinated by a traditional hand-wound movement, there is a special series of our classic 903 navigation chronograph. This navigation chronograph has everything you need for precise orientation in time and space. The minute counter and the small second counter are at 3 and 9 o'clock respectively, while the hour counter is positioned at 6 o'clock. The second stopwatch hand at the center of the timepiece has a red triangular tip. The design of the classic Lemania movement permits the integration of an additional complication in the Sinn 903 H4: the moon phase display is positioned in the circular field for the hand date at 12 o'clock. Thus a fourth time display completes the selection on the inner surface of the dial, making this model the most complex version of our navigation chronograph.
![](https://www.sinn.de/out/pictures/generated/product/11/640_360_100/sinn_903h4_k.jpg)
Technical details
Hand-wound movement
17 bearing jewels
21,600 semi-oscillations per hour
Seconds stop function
Shock resistant as per DIN ISO 1413
Anti-magnetic as per DIN 8309
The information on the mechanical movement corresponds to the current production situation in Frankfurt am Main. Due to technical changes, it may happen in individual cases that stock items of our sales partners deviate from this information.
Sapphire crystal glass in front, anti-reflective on both sides
Transparent case back made of sapphire crystal glass, anti-reflective on the interior
Case back screw-fastened
Meet the technical requirements for waterproofness, as set out in standard DIN 8310
Pressure-resistant up to 10 bar
Low pressure resistant
Hand date
Moon phase display
Chronograph
Interior rotating bezel with logarithmic scale (slide-rule function)
Band lug width: 22 mm
Case thickness: 13,2 mm
Weight without strap: 73 gramme
Indices coated with luminescent colour
Hour and minute hand coated with luminescent colour