M3440 Professional compax Chronograph

Self-winding 42 mm chronograph in stainless steel, water-resistant to 10 bar (100 static metres). Luminous dial, hands and bezel insert. German top grain leather strap with stainless steel buckle.

The Siduna team proudly released this iconic design in a numbered edition, entirely designed and assembled in Sweden.

«...The price of this watch puts it in line with the most notable purveyors of functional chronographs at the present moment, Sinn, Junghans, Damasko, Guinand and so forth. Put this watch in the mix with any of those brands and Siduna come out well in the comparison in terms of tech and in terms of value...»

Dave Sweeting, TZ-UK

«...I love little design tricks like this, and it’s this extra effort that makes or breaks a design... Overall, I think this is a really exciting offering from Siduna, As a fan of these sorts of watches, I’m happy to see a faithful recreation with some cool functionality at a reasonable price...»

Ilya Ryvin, Worn & Wound Managing Editor



The Siduna M3440 chronograph is based on a 1973 military standard from the Swedish Air Force (Svenska Flygvapnet). The frame reproduces a design from Ervin Piquerez SA from 1968 that was used by more than half-a-dozen brands such as Breguet, Bucherer, Heuer, Lemania, Rodania, Sinn and Wakmann.
Water-resistant to pressures of 10 bar, it uses a satin PVD black steel bezel insert with luminous numerals.

Siduna M3440 dial

«...Upon closer examination, several people were struck by the level of finish, as well as the look and feel of the watch itself... It is first rate... It gets a very solid two thumbs up from this reviewer, without a doubt one of the best automatic chronographs I have worn in some time.»

James Henderson, Tempus Fugit Watch



The 0.6 mm thick dial uses a double 0.3 mm plate that is finished in a deep black galvanic electro-plating. True to the 1973 military specification, the dial features numerals and 5 minutes marks with stacked layers of high grade Swiss luminous compound from RC Tritec AG.

siduna hands fitting


Calibre 13 Phi and 13 Upsylon

Our movements are based on an automatic ETA 7750 with Top finishing. They undergo several substantial modifications in a small workshop from La Chaux-de-Fonds, such as the removal of the date mechanism and the relocation of the minutes subsidiary dial from 12 o'clock to 3 o'clock thanks to a proprietary module, and an upgrade to blue screws. The calibre 13 Phi received additional modifications on the back side to add the fly-back function.

Siduna Calibre 13


Numbered edition, from 001 to 100

Remaining available serial numbers will be allocated on a "first come, first served" basis, with the following numbers being put on auction: 001 to 010, 019, 080, 088 and 099.



The M3440 comes by default on a fine German top grain calf available in black, havana brown or rouille colour.

si 51l strap black
full grain leather - black

full grain leather havana
full grain leather - havana

full grain leather rouille
full grain leather - rouille

Professional Compax Chronograph


Classic model with 42 mm bezel. Assembled and tested by Siduna. Available with black, havana or rouille top grain leather strap.

Order Here
(delivery the following business week)


Standard Issue € 1,480 (€ 1,850 incl. tax *)

SI-M3440KC5 Add to cart

Harlequin Dial€ 1,480 (€ 1,850 incl. tax *)

SI-M3440HC5 Add to cart

Temporarily Out of Stock
(Delivery January 2020)


Standard Issue € 1,860 (€ 2,325 incl. tax *)

SI-M3440KF5 Add to cart

Harlequin Dial€ 1,860 (€ 2,325 incl. tax *)

SI-M3440HF5 Add to cart

Tax only applies to E.U. residents 25%

Worldwide delivery from Sweden free

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Pay via bank wire

Account holder Woodshores AB
Account address Artillerigatan 58
Landskrona 261 33 Sweden
Bank name SEB (Skandinaviska Enskilda Banken)
Bank address Rissneleden 110
Stockholm 106 40 Sweden
IBAN (EUR)SE69 5000 0000 0512 3820 8630

secure payments with Stripe

Technical Specifications

Dimensions and Weight

  • Bezel diameter 42.0 mm
  • Lug width 20.0 mm
  • Case thickness 16.1 mm
  • Weight without strap 92 g

Mechanical movement

  • ETA/Valjoux 7750 base
  • Thickness 7.9 mm
  • Self-winding mechanism
  • 25 bearing synthetic rubies
  • 28'800 alternances per hour (4 Hz)
  • Seconds stop
  • ISO 764 Anti-Magnetic
  • ISO 1413 Shock-Resistant


  • Austenic stainless steel, satin brushed
  • Double-domed aspheric sapphire crystal, anti-reflective coating on the inside
  • Screw-down case back, individually numbered
  • Screw-down crown
  • ISO 22810 Water-Resistant
  • Pressure-resistant to 10 bar


  • Hours, minutes and subsidiary seconds
  • 30 minutes and ¼ seconds chronograph

Dial and Hands

  • Matte black dial with recessed subsidiary dials
  • 5 minutes indices with Super-LumiNova® BL C3 Grade A
  • Numerals with Super-LumiNova® BL C3 Grade A
  • Hour and minute hand coated with Super-LumiNova® BL C3 Grade A

Limited Warranty

  • 2 years