The Vaer A5 Field (Black & White) is a 40mm automatic field watch that blends classic military-inspired design with ocean-ready durability and full USA assembly. As part of the A5 automatic field collection, it combines slim proportions, mechanical reliability, and everyday versatility.
This guide covers essential operation and handling for all A5 Field models. For deeper technical detail on mechanical movements, servicing intervals, and long-term care, refer to Vaer’s full Mechanical Watch Care & Handling Guide.
1. Purpose & Design Overview (A5 Field Collection)
The A5 Field is the automatic evolution of the C5 Field—Vaer’s foundational modern field watch design. It was created to deliver a clean, highly legible, everyday tool watch with timeless proportions and subtle detailing.
Available dial configurations:
- A5 Field Black – Matte black dial with high-contrast Arabic numerals
- A5 Field White – Matte white dial with black Arabic numerals
Both models share identical case construction, movement, and operating principles.
Case specifications:
- 40mm case diameter
- 48mm lug-to-lug
- 10.4mm thickness
- 20mm lug width
- Approx. 74g case weight
- 316L stainless steel case
- Single-domed sapphire crystal with AR coating
The 40mm case offers a medium wrist presence and is recommended for wrists approximately 6.5”–8.5”. Despite its rugged functionality, the case remains slim and ergonomic for extended daily wear.
2. Movement & Assembly (Miyota 9015)
The A5 Field is powered by the Japanese Miyota 9015 automatic (self-winding) movement.
- 28,800 beats per hour (4 Hz)
- 42-hour power reserve
- 24 jewels
- Regulated to approximately -5/+15 seconds per day
- Assembled in the United States
The movement winds automatically through wrist motion. If not worn for longer than its 42-hour reserve, it may be manually wound.
Manual Winding
- Ensure the crown is fully screwed down.
- Unscrew the crown counterclockwise.
- Wind clockwise 20–30 turns.
- Push inward and screw down securely.
3. Water Resistance & Crown Operation
The A5 Field is rated to 10 ATM / 100 meters of water resistance.
This rating is suitable for:
- Rain and snow
- Showering
- Swimming and surface water exposure
The watch uses a locking screw-down crown to maintain water resistance.
To secure the crown:
- Press gently toward the case
- Rotate clockwise until snug
- Do not overtighten
Important: Never expose the watch to water unless the crown is fully screwed down. Proper crown use is required for warranty coverage.
4. Setting the Time and Date
The A5 Field includes a date window and hacking seconds for precise time setting.
- Unscrew the crown counterclockwise.
- Pull to the first click to adjust the date.
- Pull to the second click to adjust time (seconds hand stops).
- Rotate to set correct time.
- Push inward and screw down securely.
Date adjustment note: Avoid adjusting the date between approximately 2:00 AM and 10:00 PM to prevent damage to the date-change mechanism.
5. Dial, Markers & Lume
Both A5 Field models feature Arabic hour numerals, 24-hour inner markers, and a date window.
A5 Field Black:
- Vaer Lume Performance Rating: 6/10
- 15 layers Old Radium Super-LumiNova on dial
- Old Radium lume on hour, minute, and second hands
- Matte black dial
A5 Field White:
- Vaer Lume Performance Rating: 6/10
- 15 layers Old Radium Super-LumiNova on dial
- Old Radium lume on hour, minute, and second hands
- Matte white dial with black numerals
The combination of 24-hour markers and restrained color accents delivers a clean, highly legible field-watch layout suitable for everyday use.
6. Sapphire Crystal & Case Construction
The A5 Field uses a single-domed sapphire crystal with anti-reflective coating for enhanced clarity and scratch resistance.
Sapphire measures 9 on the Mohs hardness scale and provides strong resistance to daily abrasion.
The rounded 316L stainless steel case is designed for ergonomic comfort during activities such as hiking, travel, surfing, or mountain biking.
7. Straps & Bracelet Compatibility
The A5 Field uses 20mm interchangeable straps and is compatible with all Vaer straps.
- Rubber straps
- Nylon straps
- Leather straps
- Custom-fit stainless steel bracelet
Standard straps fit wrists approximately 6.4”–8.5”, with specialty sizing options available.
8. Shock, Magnetism & Serviceability
The Miyota 9015 is a durable automatic movement designed for daily wear.
- Avoid hard drops onto stone or concrete
- Avoid repeated heavy impacts
- Avoid prolonged exposure to strong magnetic fields
As a mechanical watch, periodic servicing is recommended over the long term to maintain lubrication, accuracy, and seal integrity.
9. Long-Term Ownership Philosophy
The A5 Field represents Vaer’s original automatic field platform—a balanced, highly legible tool watch built for daily use and long-term ownership. Its slim profile, sapphire crystal, 100m water resistance, and full USA assembly position it as a versatile mechanical watch suitable for both field use and everyday wear.
The A5 Field includes a 2-year guaranteed waterproof warranty.
With sensible care and periodic servicing, the Miyota 9015 movement can provide multi-decade service life.
