Introduction
This manual provides essential instructions for the proper setup, operation, and maintenance of your JACK MASON Aviation 38mm Watch, model JM-A401-002. Please read this manual thoroughly before using your watch to ensure optimal performance and longevity.
Product Overview
The JACK MASON Aviation watch is a precision timepiece designed for reliability and style. Familiarize yourself with its key components.

Figure 1: Front angled view of the JACK MASON Aviation 38mm Watch, featuring a blue dial with Arabic numerals, a date window, and a green fabric strap.

Figure 2: Side view of the watch case, highlighting the crown with the brand's star logo, used for time and date adjustments.

Figure 3: Rear view of the watch, showing the case back and the green fabric strap with its buckle.
Components:
- Crown: Used for setting the time and date.
- Dial: Features Arabic numerals for clear time reading and a date window.
- Hands: Hour, minute, and second hands.
- Strap: Durable fabric strap for comfortable wear.
- Case: 38mm diameter, round shape, with mineral glass crystal.
Setup
1. Setting the Time
- Pull the crown out to the second click position. The second hand will stop.
- Rotate the crown to set the hour and minute hands to the desired time.
- Push the crown back in to the normal position. The second hand will resume movement.
2. Setting the Date
- Pull the crown out to the first click position.
- Rotate the crown (typically clockwise or counter-clockwise) to adjust the date.
- Once the correct date is displayed, push the crown back in to the normal position.
- Avoid setting the date between 9 PM and 3 AM, as this can damage the movement.
Operating Your Watch
Wearing the Watch
Adjust the strap to fit comfortably on your wrist, ensuring it is not too tight or too loose. The watch should be secure enough not to slide freely but loose enough to allow air circulation.
Water Resistance
Your JACK MASON Aviation watch is rated for 100 meters (10 ATM) of water resistance. This means it is suitable for swimming, snorkeling, and showering. However, it is not suitable for scuba diving. Always ensure the crown is fully pushed in before any contact with water.
- Do not operate the crown while the watch is wet or submerged.
- Avoid exposing the watch to hot water or steam, as this can compromise the seals.
- Rinse the watch with fresh water after exposure to saltwater.
Maintenance
Cleaning
Wipe the watch case and crystal regularly with a soft, dry cloth. For the fabric strap, a mild soap solution and a soft brush can be used, followed by thorough rinsing and air drying.
Battery Replacement
This watch uses a quartz movement, powered by a battery. When the battery runs low, the second hand may start to jump every few seconds (End-of-Life indicator). It is recommended to have the battery replaced by a qualified watch technician to ensure proper sealing and maintain water resistance.
Storage
When not wearing your watch, store it in a cool, dry place away from direct sunlight and strong magnetic fields.
Troubleshooting
- Watch not running:
- Check if the crown is fully pushed in.
- The battery may need replacement. Consult a professional watch technician.
- Time inaccuracy:
- Ensure the time was set correctly.
- Exposure to strong magnetic fields can affect quartz accuracy. Keep the watch away from magnets.
- A low battery can also cause irregular timekeeping.
- Condensation under crystal:
- This indicates a potential breach in water resistance. Have the watch inspected by a professional immediately to prevent further damage.
Specifications
| Feature | Detail |
|---|---|
| Brand | Jack Mason |
| Model Number | JM-A401-002 |
| Display Type | Analog |
| Movement | Quartz |
| Special Features | Arabic Numerals, Date Display |
| Water Resistance | 100 Meters (10 ATM) |
| Case Shape | Round |
| Dial Color | Blue |
| Band Color | Green |
| Crystal Material | Mineral Glass |
| Case Diameter | 38 mm |
| Band Width | 18 mm |
| UPC | 840645172911 |
Warranty Information
Your JACK MASON watch is covered by a limited warranty against manufacturing defects. Please refer to the warranty card included with your purchase for specific terms, conditions, and duration. Keep your proof of purchase for warranty claims.
Customer Support
For further assistance, technical support, or service inquiries, please contact JACK MASON customer service through their official website or the contact information provided with your product packaging.
Please have your model number (JM-A401-002) and proof of purchase ready when contacting support.