Frequently Asked Questions


Who Is Siduna?


Siduna is an independent watchmaker from Southwest Sweden operated by two industry professionals and a financial controller under Woodshores AB, a privately-held company registered with the Swedish chamber of commerce under the reference number 559058-1871, with headquarters in Landskrona, Scania county.


What does Établissage mean?


Établissage is the French name of a 19th manufacturing process that focuses on combining finished components into a product under one roof, rather than producing components from raw materials. The tasks involve: taking delivery and inspecting components before adding them to the inventory, regulating movements, fitting the dial and hands, casing watch heads before fitting straps, and carrying out the final inspection before packaging and displatching.


What Level of Quality Can Be Expected from Siduna?


Analysis of watches that have been produced between 1950 and 1990 shows that the ones that are easiest to keep in working conditions correspond to the Upper Middle segment or above. Based on this, Siduna watches are designed and produced with the same principles, but with modern materials. In consequence, the lifetime of a Siduna watch can theoretically be unlimited, as long as it receives basic servicing every 4 to 5 year.

TIER 9 - Master Watchmaker above 35 000 €
TIER 8 - High End above 10 000 €
TIER 7 - Lower High End 5 000 € to 10 000 €
TIER 6 - High Middle 2 500 € to 5 000 €
TIER 5 - Upper Middle 1 200 € to 2 500 €
TIER 4 - Low Middle 600 € to 1 200 €
TIER 3 - Upper Low End 300 € to 600 €
TIER 2 - Low End 75 to 300 €
TIER 1 less than 75 €


How Reliable Are Siduna Watches?


Siduna mechanical movements are individually regulated on a timer within −4/+6 seconds/day, and are sourced from Swiss factories that deliver a consistent quality from batch to batch.


What Determines the Price of a Siduna Watch?


We cater to discerning customers, so our movements come in decorated finishing. We buy in very small quantities from a family business in La Chaux-de-Fonds, Switzerland, and each movement undergoes further mechanical transformations that are normally not available from a wholesaler: we have the date mechanism removed and the 12h subsidiary dial relocated at 3h. We also have parts replaced at the back to add the Flyback version.

We maintain a fully-equipped workshop and a complete inventory of spare parts, all under the care of a properly registered company that pays taxes, rent, importing fees, currency exchange fees, banking fees, accounting and expenses.


Why does the M3440 look like other vintage pilot chronographs?


The 1973 Lemania 817 that was delivered as the Swedish military standard M3440-051010 used a case that was designed in 1968 by Ervin Piquerez SA, and a dial design characteristic of the 1930's. At the time of production, components design were supplier-owner rather than brand-owned and military watches were the result of government tenders that were borrowing from each other.

The compressor case of the M3440 was sold to several brands of the time, such as Heuer, Breguet, Sinn, Chronograph Swiss, Bucherer, Rodania, Selectron, Tissot or Wakmann.


Why is a two register chronograp called uni-compax?


The nomenclature was introduced in the 1930's and used by brands such as Universal Genève: the running seconds are often the first susidiary dial, so a second subsidiary dial makes it a compur or uni-compax layout. A third subsidiary dial makes it a bi-compax, and a fourth subsidiary dial a tri-compax.


What are the calibre 13 Phi and 13 Upsylon, and where Do They Come From?


The calibres 13 Phi and 13 Upsylon are based on an ETA 7750™ that receives substantial modifications:
  1. Both movements have the date complication removed to stay true to the spirit of the original M3440.
  2. On the dial side, both the calibre 13 Phi and the calibre 13 Upsylon receive two additional wheels to relocate the 30 minutes indicator from the 12h position to the 3h position.
  3. On the back side, the calibre 13 Phi undergoes several modifications to implement the flyback function.



How Do I Take Good Care of my Watch?


  • Daily wear: the leather of your strap is sensitive to water, sweat and any other liquid. Avoid getting it wet and remove it while sleeping to allow the leather to slowly dry up.
  • Leather: avoid getting your leather strap damp or wet. If it happens, make sure to keep the strap in a well ventilated spot to let it slowly dry up away from heat and sunlight.
  • Cleaning: use a damp cloth to wipe the metal parts of the watch on a daily basis. For example after having removed the watch to take a shower or a bath, you can use your damp towel to wipe off the water-resistant case and the buckle.
  • Salty water: after contact with salty water or excessive sweat, always rinse your watch in fresh water.
  • Screw-down crown: always make sure that you have locked in the crown to prevent moist from getting in.
  • Pushers: do NOT try to operate the pushers under the water.
  • Shocks: avoid subjecting your watch to shocks, which will accelerate ageing and might cause a component to break.
  • Temperature: avoid exposing your watch to sudden changes, from extreme cold to extreme heat or the other way around.
  • Magnetic field: avoid putting your watch near a loudspeaker, a refrigerator, or any other type of device that emits magnetic fields.


What Does the Water-Resistance Rating Mean?


Our watches are designed to pass laboratory testing, where we artificially create the pressure of a column of water.
So for example a rating of 10 bar only means that the watch will be fine if it stands still under a column of 100 metre (333 ft.) of water.
If you swim or dive with your watch, the simple underwater movements of your arm will subject the watch to higher pressures than the column of water that it is under.


Where and how Often Should a Siduna Watch Be Serviced?


Depending on the climate that it is exposed to and the care that it receives, a mechanical watch should be serviced every 4 to 5 years. Our movements use standard Swiss anchor lever constructions, so as long as the servicing is performed by a watchmaker who has experience in mechanical watches, it will not void the warranty.


Where Should I Have my Siduna Watch Serviced, Repaired or Refurbished?


We design, source and assemble all components ourselves, so our watchmaker knows each model inside out.
You should leave a note via our Inquiry Form or email to customer.service@woodshores.com.


Is it Possible to Get Spare Siduna Parts?


When it comes to the contemporary production, our watchmaker can handle all the servicing, repair and refurbishing. However, in compliance with European law we welcome independent watchmakers to return damaged Siduna parts of the contemporary production to purchase new ones.

We do also offer servicing and repair services on vintage Siduna watches, and you are welcome to contact us via our Inquiry Form or email to customer.service@woodshores.com to see how we can help with your vintage watch.