Fortis Cosmonaut Official Cosmonauts Chronograph Monolith
Reference 638.18.31
About this watch
The Fortis 638.18.31 is a robust tool that combines functionality, style, and a sprinkle of space adventure. This Swiss brand has carved out a niche for itself in the universe of aviation and space watches, so it’s no surprise that they’ve been the official timekeeper for astronauts. The watch features a sleek black PVD coating, Arabic numeral indexes, and stick hands ensuring readability. It's powered by the ETA caliber 7750, an automatic movement renowned for its reliability and precision. With a water resistance of 200 meters, this watch is more than capable of handling aquatic adventures. Its closed back adds a touch of mystery to the watch, allowing the external beauty to shine without revealing too much inside. The Fortis 638.18.31 features a lug width of 20 mm, making it versatile enough for both adventurous outings and formal occasions.
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Key Features
- Automatic ETA movement with 25 jewels and 42-hour power reserve
- 200m water resistance for aquatic adventures
- Rotating bezel with 0-60 scale for tracking elapsed time underwater
- Black PVD coating for a sleek, modern look
- Arabic numeral indexes and stick hands for readability
- Robust and durable design for everyday wear
Specifications
- Brand
- Fortis
- Family
- Cosmonaut
- Model
- Official Cosmonauts Chronograph Monolith
- Reference
- 638.18.31
- Movement
- 7750
- Movement Features
-
- Hours, Minutes, Small Seconds
- Date, Day
- Chronograph
- Case
- Stainless Steel 42mm
- Dial Color
- Black
- Crystal
- Sapphire
- Water Resistance
- 200
Current Listings
![[WTS] Fortis Official Cosmonaut GMT 611.22.148. priced to move.](https://preview.redd.it/a1ufiu5350ag1.jpg?width=640&crop=smart&auto=webp&s=1d12d14b6f998328c53d89670284ed03949fd3be)
Fortis Official Cosmonaut GMT 611.22.148. priced to move.
A 1990s Fortis Cosmonaut GMT with a mix of vintage charm and modern build quality, featuring a stainless steel case, ETA 2893-2 movement, and bidirectional bezel.
- Condition: used, good for a 90s reference
- Case dimensions: 39 x 10.5 x 45mm
- Lug width: 20mm
- Movement: ETA 2893-2
![[WTS] Fortis Classic Cosmonauts Ceramic p.m. w/ boxes](https://preview.redd.it/5km05eywyl9g1.jpg?width=640&crop=smart&auto=webp&s=ee597ceeee68cf4f3b43c96e7e3903becae54a2f)
Fortis Classic Cosmonauts Ceramic p.m. w/ boxes
This Fortis Classic Cosmonauts watch features a matte black dial and is powered by the Valjoux 7750 movement. The watch has a ceramic bezel and a sapphire crystal.
- Condition: Excellent
- Movement: Valjoux 7750
- Case diameter: 42mm
- Case height: 15mm