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  • 857 SEK Frankfurt am Main

    Special-operations watch to celebrate the 40th anniversary of SEK Frankfurt am Main.

    857 SEK Frankfurt am Main


Warranty period leer years

Warranty Statement


Product number: 857.013 PDF

857 SEK Frankfurt am Main

This model is no longer available in our current range.
857 SEK Frankfurt am Main

The Frankfurt am Main special police unit (SEK – Spezialeinsatzkommando) was officially founded in 1974. On the occasion of its 40th anniversary, Sinn Spezialuhren and the SEK Frankfurt am Main have come together to develop the SEK 857 SEK Frankfurt am Main special-operations watch.

Forty years and counting: SEK Frankfurt am Main decided to mark the occasion with a special watch. To develop the watch, SEK Frankfurt am Main, which has earned an exceptional reputation throughout and beyond Germany, turned to Sinn Spezialuhren without hesitation. After all, Sinn Spezialuhren is also highly respected throughout the world, particularly for its timepieces developed purely with the specific functionality and operational requirements in mind. Close collaboration was therefore an obvious solution. The two Frankfurt institutions also have a close association with the city of Frankfurt am Main. This is expressed symbolically on the dial of the special watch with an adapted coat of arms of the SEK – the Frankfurt eagle and sword.

The operational requirements formulated by SEK members through a specifications book and implemented by Sinn Spezialuhren served as the technical basis for the development of the 857 SEK Frankfurt am Main special edition. The case is made of bead-blasted stainless steel and has a diameter of 43 mm. The surface was hardened with TEGIMENT Technology, ensuring that the case is scratch-resistant. The range of features also includes Ar-Dehumidifying Technology for greater functional reliability and freedom from fogging as well as magnetic field protection of up to 80,000 A/m. The rotating captive pilot’s bezel with minute ratcheting is securely connected to the case. The watch is fitted with high-quality sapphire crystal glass, pressure-resistant to 20 bar (= 200 m water depth) and resistant to low pressure.

The 857 SEK Frankfurt am Main special edition was created on a one-off basis and was not freely available for purchase. As an unofficial piece of equipment, it was available exclusively to active or former SEK members.

Special characteristics
  • 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 80,000 A/m
  • Nickel-free case back
  • Captive pilot's bezel with minute ratcheting
  • Sapphire crystal glass
  • 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
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.

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
Pressure-resistant to 20 bar
Low pressure resistant
Hours, minutes, seconds
Date display
Pilot’s bezel with minute ratcheting and luminous key mark
SINN Technologies
TEGIMENT Technology, therefore especially scratch-resistant
Captive bezel
Ar-Dehumidifying Technology enhances functional reliability and freedom from fogging
Magnetic Field Protection up to 80,000 A/m
Dimensions and Weight
Case diameter: 43 mm
Band lug width: 22 mm
Case thickness: 12 mm
Weight without strap: 90 gramme
Dial and Hands
Matte black dial
Numbers and indices coated with luminescent colour
Hour and minute hand coated with luminescent colour

857 SEK Frankfurt am Main configure

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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 857 SEK Frankfurt am Main.

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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