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What differs between the F-39 and F-41?
The case dimensions are the clearest distinction in Fortis’s listed specifications. The two-millimetre diameter difference is accompanied by a two-millimetre difference in lug-to-lug length. Both watches share the same listed height, movement and principal functions.
| Specification | F-39 | F-41 |
|---|---|---|
| Case diameter | 39 mm | 41 mm |
| Lug to lug | 50 mm | 52 mm |
| Height | 12.5 mm | 12.5 mm |
| Watch-head weight | 79 g | 86 g |
| Water resistance | 200 m / 20 atm | 200 m / 20 atm |
| Movement | Automatic UW-30 | Automatic UW-30 |
| Display | Date | Date |
| Power reserve | 38 hours | 38 hours |
| Regulation | Chronometer | Chronometer |
| Official price example | CHF 2,450, Original Block Bracelet | CHF 2,450, Original Block Bracelet |
Specifications and the Block Bracelet price examples are from Fortis’s current product and collection listings reviewed in October 2026. Weight is listed as 79 g for the F-39 and 86 g for the F-41; the figures refer to the watch head, not a complete bracelet setup. Dimensions can help narrow a fit choice, but they cannot establish how either watch will feel on a particular wrist.
What the shared specifications mean
Movement and timekeeping
Fortis lists an automatic UW-30 calibre in both models, with a date display, 38-hour power reserve and chronometer regulation. Monochrome Watches reported at the watches’ 2020 launch that the UW-30 is based on the Sellita SW 200-1, with 26 jewels and a 4 Hz frequency. That is launch-era reporting rather than a current independent teardown or a test of these individual watches.
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- Hypoallergenic 316L stainless steel case / ideal size 42mm x 48mm x 13mm / internal bi-directional rotating bezel for timing functions / specially designed grooved crowns for grip
- Industry known quality Seiko NH-35A automatic movement / screw down crown with hacking mechanism to set time down to the seconds
- Sapphire crystals with blue anti-reflective coating inside / exhibition caseback
- Cockpit inspired aviation dial / discreate date / official military numbers / Swiss Super-Luminova hands, numbers, and indices for low light and night vision
- 5 ATM (10 ATM rated) Water resistance / genuine leather strap with BYOP signed buckle
Case and water resistance
Both watches are listed with recycled stainless-steel cases, 200 m (20 atm) water resistance and a screw-down crown using a triple-gasket system. Fortis specifies sapphire crystal with anti-reflective coating on both sides. These manufacturer specifications do not, by themselves, establish a particular diving certification.
Dial and bezel
The Original versions combine a bidirectional 12-hour bezel with half-hour increments and a dial featuring luminous Brix and Brixtrack markers. Fortis also includes an orange Synchroline feature, which the brand says aids synchronization within ±5 seconds. That is Fortis’s description of the feature, not an independently measured accuracy result.
Rank #2
- Movement: Japan MIYOTA 8215 Mechanical Automatic Movement, Automatic winding, second stop device, 40 hours of energy storage, quite accurate.
- Sapphire Mirror: The watch mirror is made of sapphire glass, which is Hard texture and less prone to scratches.
- Fashion watch: This Pilot watch is made of Stainless steel Lassa craft case, genuine leather strap, which not only ensures the comfort of the wrist, but also can easily match your clothes. Fits wrists from approximately 152mm to approximately 228mm.
- Waterproof & Luminous: The Aviator watch is water resistant to 50 methers, It can support daily hand washing, car washing, rain and other water contact sports. Luminous hands and markers, It can see the time in dark place or at night.
- As a gift: watches are suitable for outdoor sports such as running, sports, fishing, dating, new year, christmas, thanksgiving, hollywood, wedding, anniversary, birthday, graduation, father's day, birthday party, corporate events.
How to choose a size
Choose the F-39 if the smaller dimensions suit your preference
Its 39 mm diameter and 50 mm lug-to-lug measurement make the F-39 the smaller of the pair. Those figures are useful when comparing it with a watch you already own, but they are not a guarantee of comfort or fit.
Choose the F-41 if you prefer the larger case
The F-41 adds 2 mm in diameter and 2 mm in lug-to-lug length while retaining the same listed 12.5 mm height. Its stated watch-head weight is 86 g, compared with 79 g for the F-39. Neither size has a different movement or listed core function.
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Rank #3
- Mechanical Movement: Japan MIYOTA 8215 Mechanical Automatic Movement, Frequency 21600 Times Per Hour (3Hz), Second Stop Device, Automatic Winding, 40 Hours of Energy Storage, quite accurate.
- Luminous：Luminous hands and markers.It can see the time in dark place or at night.
- Waterproof Watches: The watch is water resistant to 50 methers It can not only support daily hand washing, car washing, rain and other water contact sports, but also support long-term water sports such as snorkeling and swimming, diving.
- Fashion Watch: This men's watch is made of stainless steel Case, which not only ensures the comfort of the wrist, Also can easily match your clothes. Fits wrists from approximately 152mm to approximately 228mm.
- We provide professional services. If you need more detailed information about our watch, please contact us. We will be happy to answer and help you at any time.
Price by configuration
Fortis’s collection page reviewed in October 2026 listed Original models at CHF 2,450 on the Block Bracelet and CHF 2,100 on the Aviator Strap. These are Swiss-franc listing examples, not universal landed prices: regional market settings, taxes, availability and configuration can affect what a buyer sees.
| Configuration | F-39 | F-41 |
|---|---|---|
| Original on Block Bracelet | CHF 2,450 | CHF 2,450 |
| Original on Aviator Strap | CHF 2,100 | CHF 2,100 |
Monochrome Watches reported launch-era prices in 2020 of EUR 2,400 on steel and EUR 1,950 on leather. Those historical euro prices are not directly comparable with Fortis’s current Swiss-franc examples; the dates, currencies and market contexts differ, so they should not be read as a price increase calculation.
Rank #4
- Movement: Japan MIYOTA 8215 Mechanical Automatic Movement, Automatic winding, second stop device, 40 hours of energy storage, quite accurate.
- Sapphire Mirror: The watch mirror is made of sapphire glass, which is Hard texture and less prone to scratches.
- Fashion watch: This Pilot watch is made of Stainless steel Lassa craft case, genuine leather strap, which not only ensures the comfort of the wrist, but also can easily match your clothes. Fits wrists from approximately 152mm to approximately 228mm.
- Waterproof & Luminous: The Aviator watch is water resistant to 50 methers, It can support daily hand washing, car washing, rain and other water contact sports. Luminous hands and markers, It can see the time in dark place or at night.
- As a gift: watches are suitable for outdoor sports such as running, sports, fishing, dating, new year, christmas, thanksgiving, hollywood, wedding, anniversary, birthday, graduation, father's day, birthday party, corporate events.
Colorways, warranty and included items
Fortis’s current collection shows variants including Original, Black, Petrol and Liberty Blue. Color and configuration availability can vary by market, so confirm the exact version on the listing for your region.
The current F-39 product listing states a five-year manufacturer warranty and includes a performance certificate and user manual. It also lists an Alpha Box and reversible screwdriver; webshop bracelet orders additionally list a Mirror Tool for bracelet adjustment. Check the applicable regional terms for warranty details.
Best Value
- Mechanical Movement: Japanese NH35A Mechanical Automatic Movement, Frequency 21600 Times Per Hour (3Hz), Second Stop Device, Bidirectional Automatic Winding, 42 Hours of Energy Storage, quite accurate.
- Luminous：Luminous hands and markers.It can see the time in dark place or at night.
- Waterproof Watches: The watch is water resistant to 50 methers It can not only support daily hand washing, car washing, rain and other water contact sports, but also support long-term water sports such as snorkeling and swimming, diving.
- Fashion Pilot Watch: This men's watch is made of stainless steel Case, which not only ensures the comfort of the wrist, Also can easily match your clothes. Fits wrists from approximately 152mm to approximately 228mm.
- We provide professional services. If you need more detailed information about our watch, please contact us. We will be happy to answer and help you at any time.
Fortis describes the Flieger’s design as ensuring “the best readability ever, day or night.” That is the brand’s claim, rather than an independently measured comparison.
Quick Recap
Sources
- Fortis F-39 product listing
- Fortis F-41 product listing
- Fortis Flieger collection
- Monochrome Watches, 2020 launch-era hands-on
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
