M3440 Professional Uni-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.

After more than 10 months of development, the Siduna team is proud to release this iconic design in a numbered edition, entirely designed and assembled in Sweden.



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



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 nitrile rubber strap, but options include a fine German top grain calf available in black, havana brown or rouille colour.

full grain leather black
full grain leather - black

full grain leather havana
full grain leather - havana

full grain leather rouille
full grain leather - rouille

Professional Uni-compax Chronograph


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

Order form, delivery January 2019

Uni-compax, self-winding, no date

Add to cart € 1,860.-

Add Flyback feature

Add to cart + € 480.-

Choose a strap

Default strap is the rubber strap + € 0.-

Full grain leather - black + € 40.-

Full grain leather - havana + € 40.-

Full grain leather - rouille + € 40.-

Delivery from Sweden + € 60.-

VAT for E.U. residents 25%

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Technical Specifications

Dimensions and Weight

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

Mechanical movement

  • Swiss Made calibre 13 Upsylon
  • 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

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