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  • NaBo 56/8

    The cockpit navigation chronograph.

    NaBo 56/8
  • NaBo 56/8


Warranty period leer years

Warranty Statement


Product number: 4.568 PDF

NaBo 56/8

This model is no longer available in our current range.
NaBo 56/8

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.

Special characteristics
  • 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

Technical details

Mechanical 8-day movement by Revue Thommen B17
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.

Case made of aluminium, black
Mineral glass in front, anti-reflective on both sides
Case back screw-fastened
Low pressure resistant
Hours, minutes, seconds
Chronograph with centred stopwatch minute hand
Interior pilot’s bezel
SINN Technologies
Meets EASA Form 1 requirements and the military test specification MIL-C-38207A
Temperature resistance technology, therefore functionally reliable at temperatures from -35 °C up to +55°C
Especially resistant to vibration and shock

Dimensions and Weight
Case: 60 x 60 mm
Installation depth: 25 mm
Weight: 200 gramme
Dial and Hands
Matte black dial
Numbers and counters coated with non-persistent fluorescent luminous colour

NaBo 56/8 configure

Watch strap
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Warranty statement

In addition to the statutory warranty, we – Sinn Spezialuhren GmbH, Wilhelm-Fay-Strasse 21, 65936 Frankfurt am Main – provide a manufacturer’s warranty against material and manufacturing defects for the watch NaBo 56/8.

The warranty period is leer years.

The warranty period is calculated from the invoice date.

Our warranty is applicable worldwide.

If you wish to make a warranty claim, we will repair the watch for you at no additional cost.

Warranty claims are excluded in the event of damage caused by:

  • Improper use
  • Repairs or attempted repairs which were not carried out by us or our authorised partners. A list of authorised partners can be found in the Sales and Service Partners menu on our website
  • Signs of wear and tear, especially to straps
  • The use of force (blows, knocks, impact)

Please inform us – Sinn Spezialuhren GmbH by phone +49 (0) 69/97 84 14-400 or email – as soon as you are aware of the potential warranty claim to avoid further damage. In order to approve the warranty, we will need the watch and proof of purchase (invoice) with a detailed description of the damage.

In the event of a warranty claim, we bear the costs of sending and returning the watch as well as the transport risk, provided that the transport is carried out by the transport company specified by us and the watch has been securely packaged. Please contact us by phone +49 (0) 69/97 84 14-400 or email Otherwise, as the customer, you will bear the costs of the shipment and the transport risk.

Any costs incurred for customs duties, import duties and other fees incurred when the watch is returned to the recipient country must be borne by the recipient.

We provide this warranty in addition to your existing statutory rights for defects. These rights are not restricted by the warranty and they can be exercised free of charge.

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