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  • 856 B-Uhr

    The observer watch.

    856 B-Uhr
  • 856 B-Uhr
  • 856 B-Uhr
  • 856 B-Uhr
  • 856 B-Uhr


Product number: 856.012 PDF

856 B-Uhr

This model is no longer available in our current range.
856 B-Uhr
The first deck watches, also known as B-Uhr watches, are considered to be the marine time pieces developed in the 18th century by English watchmaker John Harrison. They represented an important development in nautical navigation. Over time, deck watches became particularly established in the military, where they were used for locating and navigation, for coordinating procedures and for keeping to schedule.

With the 856 B-Uhr, we continue this tradition, combining the characteristic, historic look of a B-Uhr with a comfortable 40 mm diameter. As is customary with traditional B-Uhr watches, the hour hand of the 856 B-Uhr has been reduced. It points to a separate, inner hour circle, while the dominant minute hand indicates the minutes around the outside. Just like the numerals, indices and triangular main marker, the minute hand is highlighted by an ivory-coloured coating. The ordering of hour hand and minute hand on the black dial follows historical specifications: during operations, minutes were the more important unit of time, and it was important to be able to read them quickly and accurately.

The high-tech features of this watch fulfil all the criteria of a deck watch: functionality, durability, readability, precision and reliability. The surface of the bead-blasted stainless-steel case has been hardened using TEGIMENT Technology, making it especially scratch-resistant, while Ar-Dehumidifying Technology guarantees greater functional reliability and freedom from fogging. In order to minimise magnetic interface, the 856 B-Uhr is equipped with Magnetic Field Protection up to 100 mT (=80,000 A/m). A total of 856 of these unusual watches are being produced, each with an engraved limited-edition marking on the case back.
Special characteristics
  • Limited edition to 856 units
  • Case made of stainless steel, bead-blasted
  • Case made with TEGIMENT Technology and therefore especially scratch-resistant
  • Ar-Dehumidifying Technology enhances functional reliability and freedom from fogging
  • Magnetic Field Protection up to 100mT (=80,000 A/m)
  • Nickel-free case back without TEGIMENT Technology
  • Sapphire crystal glass
  • Waterproof and pressure-resistant to 20 bar
  • Low pressure resistant

Technical details

Self-winding mechanism
25 bearing jewels
28.800 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 stainless steel, bead-blasted
Sapphire crystal glass in front, anti-reflective on both sides
Case back screw-fastened, nickel-free
Crown screwable
Meet the technical requirements for waterproofness, as set out in standard DIN 8310
Waterproof and pressure-resistant to 20 bar
Low pressure resistant
Hours, minutes, seconds
Date display
SINN Technologies
TEGIMENT Technology, therefore especially scratch-resistant
Ar-Dehumidifying Technology enhances functional reliability and freedom from fogging
Magnetic Field Protection up to 100mT (=80,000 A/m)
Dimensions and Weight
Case diameter: 40 mm
Band lug width: 20 mm
Case thickness: 11 mm
Weight without strap: 70 gramme
Dial and Hands
Matte black dial
Numbers and indices coated with luminescent colour
Hour, minute and second hand coated with luminescent colour

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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 856 B-Uhr.

The warranty period is 3 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)

Loss of your waterproof watch’s water resistance is also excluded 24 months from the date of purchase.

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.

Do you want to configure your 856.012

Brown calfskin strap with leather underlay
Bead-blasted stainless steel pin buckle
1.590,00 incl. VAT
Configure watch