The Basics
The Fortis Monolith Chronograph ref. 638.18.31 features a black dial with over-sized stick indexes, housed in a PVD coated stainless steel case of 42mm. The bracelet is as black as its case.
| Brand: | Fortis |
| Family: | Cosmonautis |
| Reference: | 638.18.31 |
| Name: | Official Cosmonauts Chronograph Monolith |
| Produced: | N/A |
| Limited: | No |
Below is a detailed look at Fortis’s model 638.18.31 from Cosmonautis watch family, including the price, case details and movement features.
The Details
Fortis’s Official Cosmonauts Chronograph Monolith (638.18.31) was originally released in N/A. This watch features a automatic movement beating at a frequency of 28800 bph ( 4 Hz) to provide a 42-hour power reserve when fully wound.
The Case
The stainless steel case measures 42mm in diameter and roughly 15.5mm thick, with 20mm lug width. The round case is paired with a black color dial with stick-shaped hands, and a arabic numerals hour markers and minute track, covered by a sapphire glass. Fortis’s Cosmonautis model 638.18.31 water resistance is not available. This does not mean this watch is not water resistant. A solid caseback is over the back of the watch case.
| Material: | Stainless steel |
| Glass: | Sapphire |
| Back: | Solid |
| Shape: | Round |
| Diameter: | 42mm |
| Height: | 15.5mm |
| Lug Width: | 20mm |
| W/R: | N/A |
Case Diameter
Case Thickness
Lug Width
Water Resistance
The Movement
The Cosmonautis 638.18.31 movement is a powered by caliber 7750 made by ETA. The 25-jewel automatic movement is 30mm in diameter. Its balance wheel oscillates at 28,800 semi-oscillations per hour or 4 Hz. This movement offers a 42-hour power reserve.
| Type: | Automatic |
| Brand: | ETA |
| Caliber: | 7750 |
| Base: | N/A |
| Display: | Analog |
| Diameter: | 30mm |
| Jewels: | 25 |
| Reserve: | 42 hours |
| Frequency: | 28800 bph |
| Time: | Hours, Minutes, Small Seconds |
| Chronograph: | Chronograph |
| Additionals: |
The Price
How much does the Fortis’s Cosmonautis 638.18.31 cost? This watch was introduced in N/A and has been in Fortis’s collection for around . This watch is not a limited release. As with most luxury watches, the price of depends on the availability and demand.
CURRENT PRICE: Not Available
For more information, visit Fortis online.
Specifications:
- Brand: Fortis
- Model: Official Cosmonauts Chronograph Monolith
- Reference Number: 638.18.31
- Limited: No
Case & Dial:
- Material: Stainless steel
- Glass: Sapphire
- Back: Solid
- Diameter: 42
- Thickness: 15.5
- Lug Width: 20
- Dial Color: Black
- Indexes: Arabic Numerals and Stick-shaped hands
- Water Resistance: N/A meters
Movement:
- Winding: Automatic
- Brand: ETA
- Caliber: 7750
- Display: Analog
- Diameter: 30mm
- Jewels: 25
- Power Reserve: 42 hours
- Frequency: 28800 bph
- Functions: Hours, Minutes, Small Seconds
About Fortis
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