- Meets EASA Form 1 requirements and the military test specification MIL-C-38207A
- Mechanical 8-day movement by Revue Thommen
- Functionally reliable from –35 °C up to +55°C
- Especially resistant to vibration and shock
- Minute ring can be rotated in both directions
- Numbers and counters coated with fluorescent colour and with persistent luminescent colour
- Crystal with an anti-reflective coating on both sides
- Low pressure resistant at high flight altitudes
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.
From tradition to innovation - particularly with regard to the watches for aviators and their profession, the Sinn brand has a uniquely authentic connection to its roots. After all, Sinn became known among connoisseurs and experts for its wristwatches for pilots and cockpit navigation clocks in the early 1960s. The function and appearance of the cockpit navigation chronograph is rigorously matched to the practical requirements for its use. It has been optimized for readability to ensure absolutely unambiguous perception of the information provided - with clearly defined visual elements. The numbers, hands and indices have been given a white luminous coating for optimal contrast. This cockpit navigation clock is equipped with a particularly robust mechanical movement. It meets both the demanding specifications of EASA Form 1, which stipulate the airworthiness status and usability status of aircraft components as well as the requirements of the military test specification MIL-C-38207A. As part of this approval procedure, the instrument underwent various difficult type tests such as high and low temperature tests, vibration tests across a range of 500 to 3,000 vibrations per minute, special accuracy, power reserve, stopwatch function and magnetic field tests as well as tests at varying altitudes (low-pressure situations) and under different climatic conditions. Thus the NaBo 56 / 8 meets even the toughest professional standards and is also easy to operate thanks to its ergonomically situated push-pieces.
![](https://www.sinn.de/out/pictures/generated/product/11/640_360_100/sinn_nabo56-8_k.jpg)
Technical details
Hand-wound movement
17 bearing jewels
18,000 semi-oscillations per hour
Seconds stop function
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.
Mineral glass in front, anti-reflective on both sides
Case back screw-fastened
Low pressure resistant
Chronograph with centred stopwatch minute hand
Interior pilot’s bezel
Temperature resistance technology, therefore functionally reliable at temperatures from -35 °C up to +55°C
Especially resistant to vibration and shock
Installation depth: 25 mm
Weight: 200 gramme
Numbers and counters coated with non-persistent fluorescent luminous colour