| Movement | Automatic |
| Case material | Steel |
| Crystal material | Sapphire - anti-reflective |
| Weight | |
| Waterproof | 200 m |
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Movement
Automatic
Case material
Steel
Crystal material
Sapphire - anti-reflective
Weight
Waterproof
200 m
The Swiss Fortis Stratoliner S-41 Cool Gray F2340015 watches are a testament to the specific Fortis signature. Of course, it is the ultimate in clarity, robustness and durability. This model features a manufactory movement, developed specifically for space travel and tested in the stratosphere. However, this watch can be used not only for space travel, but also for everyday wear.
The Fortis Stratoliner S-41 Cool Gray F2340015 watch has a case made of recycled stainless steel, which is complemented by a leather strap. Inside the case, the Manufacture Swiss mechanical movement Fortis WERK 17 (made for Fortis in collaboration with La Joux-Perret Manufacture) with automatic winding works reliably. It runs at a frequency of 28,800 semi-frequencies per hour, has 26 jewels and an extended power reserve of 60 hours. The stopwatch function can be used with a minute counter at 12 o'clock and an hour counter at 6 o'clock. The movement also has a "hacking" function (stopping the second hand when ordered) and the possibility of manual winding by the crown. The movement can be observed through a transparent sapphire crystal. At the 3 o'clock position we find a practical date and day of the week display.
The perfectly clear dial is protected by a sapphire crystal that is extremely scratch-resistant. The double-sided anti-reflective coating ensures excellent legibility even in direct sunlight. The SuperLuminova luminescence, located on the hands, enables legibility in darkness and low-light conditions. The water resistance of this model is 200m, so it can handle even greater contact with water, such as swimming or diving to about 20 meters. The water resistance is supported by a screw-down crown.
TheFortis WERK 17 has been developed and manufactured in collaboration with La Joux-Perret and is the first movement to be designed and manufactured specifically for use in space. The movement has so far been tested in the stratosphere in collaboration with the Swedish Space Corporation, where thirteen bare, unprotected watches were attached to a nacelle mount. It was carried into the stratosphere by a balloon powered by helium gas. The data was then recorded on the device below. Of course, the watch's survival in the stratosphere was not the ultimate goal. It was also a prerequisite, among other things, that the precision of the operation be undisturbed. But this is only the beginning of the Fortis WERK 17's space mission. In cooperation with the Swedish Space Corporation, the movement is to be sent 30km into space to see if it can withstand harsh conditions such as microgravity, extreme temperatures and radiation.
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| Brand | Fortis |
| Gender | Male |
| Style | Pilot, Sports |
| Origin | Swiss |
| Guarantee | 5 years |
| Waterproof | 200 m |
| Movement | Automatic |
| Caliber | Fortis WERK 17 Manufacture |
| Movement accuracy in seconds | ±10 sec. / day |
Power Reserve ![]() |
60 hours |
Stopwatch measurement accuracy ![]() |
1/4 sec. |
| Case size | 41 mm |
Lug-to-lug: ![]() |
50 mm |
| Case height | 15 mm |
| Case shape | Round |
| Case material | Recyklovaná ušlechtilá ocel |
| Case color | Silver |
| Crystal material | Sapphire - anti-reflective |
| Dial | Analog |
| Dial color | Gray |
Transparent Case ![]() |
Yes |
Threaded lid ![]() |
Yes |
| Strap material | Leather |
Buckle ![]() |
Deployant Clasp |
| Strap Width | 21 mm |
| Strap color | Black |
| Date | Yes |
Stopwatch ![]() |
Yes |
Day of the week indicator ![]() |
Yes |
| Functions | Date, Day of the week, Stopwatch, Screw-on crown, Transparent back case |
Luminescence ![]() |
SuperLuminova hands |
| Other functions | 26 jewels, 28.800 oscillations / hour |
We guarantee the accuracy of the data. Did you find a mistake? Let us know and get 200 CZK on Watch purchase.
Guarantor: Kateřina Žváček
Jiří Štencek
+420 252 252 306
Mo-Th 9-19
Fr-Sa 9-16
info@helveti.eu
The product is included in categories
Men's automatic watches Men's steel watches Men's Swiss watch Men's watches with stopwatch Men's silver watches Men's sports watches Men's watches with date Men's pilot's watches Men's watches over 400 EUR Stratoliner Stratoliner Men's mechanical watches Men's watches with leather strap Men's watches with sapphire crystal Fortis Men’s Watches Fortis
The Swiss brand Fortis fully fulfills the meaning of its name, which means "strong" in Latin. It is synonymous with durability, robustness and reliability. Its purely mechanical watches serve professional pilots well, can be used underwater and have even served cosmonauts in space! In the years 1994-2019, Fortis watches were the official equipment of cosmonauts of the space agency Roskosmos. However, the foundations of Fortis' journey into space were already laid in 1961, when the founder's son Rolf Vogt showed the Fortis Spacematic AR (All Risks) watch to NASA astronauts. It was not until 1994 that the Official Cosmonauts Chronograph model looked into open space as part of the preparatory work for the historic connection of the American space shuttle Atlantis with the Russian MIR station.
Fortis is currently working with the Austrian Space Forum as the official timekeeper for the AMADEE Mars Mission simulation. From 2021, the Swedish Space Corporation became the official partner of Fortis in the testing and development of a purely space watch Fortis, where the stratospheric tests of the Werk 17 movement will be of particular interest.
The Fortis brand was founded in Grenchen, Switzerland in 1912 by Mr. Walter Vogt and, in addition to the already mentioned space successes, it has also achieved many other interesting milestones. In 1926, Fortis, in collaboration with the inventor of the first automatic movement, John Harwood, recorded the world's first serial production of a self-winding mechanical watch! Fortis introduced one of the world's first waterproof watches in 1940. Since 2018, its lifelong fan Jupp Philipp has become the owner of the Fortis brand.
Helveti.cz is an authorized dealer and specialist of the Fortis brand.
Manufacturer information: Fortis Watches AG, John Harwood-Strasse 13, 2540 Grenchen, Switzerland / info@fortis-swiss.com
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1 → We check, clean and set
We will check the functionality, set time, date and clean the watch carefully.
2 → We will carefully pack the watch
So that the watch does not have a chance to be damaged. We use special vacuum pads.
3 → We insure the watch against damage from the carrier
To be sure, we will insure the watch against breakage, so there is nothing to fear.
With each watch, you will receive a gift of your choice from us. Gifts are graduated according to the value of the order.
From €0 = Cleaning cloth, with which you can polish the glass of a watch.
From €100 = Stroke shortener, you can adjust the watch bracelet to your hand.
From €150 = Helveti canvas bag.
From €150 = Credit card knife.
From €170 = Donut watch case.
From €400 = Parker Jotter.
From €600 = knife Mikov 100-NH-2A blue.
From €1000 = Victorinox Waiter knife with 9 functions.
From €1400 = Watchroll for 2pcs.
From €1650 = Helveti leather watch roll.
From €2000 = Leather travel case.
From €2800 = Leatherman REV.
From €4000 = Wooden watch box Helveti.
From €6000 = Watch winder Helveti black.
And on top of that, a 5-year warranty (You can find the terms of the extended warranty here) and free shipping.
You can view the gifts here: