Longines L3.777.4.58.6
Longines Conquest Automatic Men's Watch Instruction Manual
Model: L3.777.4.58.6
1. Introduction
This manual provides essential information for the proper use, care, and maintenance of your Longines Conquest Automatic Men's Watch, model L3.777.4.58.6. This timepiece features a black dial, silver-tone stainless steel case and band, and an automatic movement. It is designed for durability and precision, offering a water resistance of 300 meters (1000 feet).

Image 1.1: Front view of the Longines Conquest Automatic Men's Watch (Model L3.777.4.58.6) featuring a black dial, silver-tone stainless steel case, and matching bracelet. The watch displays a date window at the 3 o'clock position and prominent hour markers.
2. Safety Information
- Avoid exposing the watch to extreme temperatures (above 60°C / 140°F or below 0°C / 32°F) or sudden temperature changes.
- Do not expose the watch to strong magnetic fields, as this can affect the accuracy of the automatic movement.
- Ensure the crown is fully pushed in and, if applicable, screwed down after setting the time or date to maintain water resistance.
- Avoid direct contact with solvents, detergents, perfumes, and cosmetic products, as they may damage the bracelet, case, or gaskets.
3. Components Overview
Familiarize yourself with the main components of your watch:
- Crown: Used for winding the movement and setting the time and date.
- Bezel: Fixed, surrounds the crystal.
- Dial: Black, displays time and date.
- Hands: Hour, minute, and second hands.
- Date Window: Displays the current date at the 3 o'clock position.
- Case: Silver-tone stainless steel, protects the internal movement.
- Bracelet: Silver-tone stainless steel with a Fold Over with Push Button Release clasp.
- Crystal: Scratch Resistant Sapphire Crystal, protecting the dial.
4. Setup
4.1. Initial Winding
Your Longines Conquest watch is equipped with an automatic movement, which winds itself with the motion of your wrist. If the watch has stopped or has not been worn for an extended period, it may require manual winding to start. To manually wind the watch:
- Unscrew the crown (if it is a screw-down crown) by turning it counter-clockwise until it springs out to position 0.
- Turn the crown clockwise approximately 30-40 times. This will provide enough power reserve to start the watch.
- The second hand should begin to move.
4.2. Setting the Time and Date
To set the time and date on your watch:
- Unscrew the crown (if applicable) and pull it out to position 1 (first click) to set the date. Turn the crown clockwise or counter-clockwise until the correct date is displayed. Avoid setting the date between 9 PM and 3 AM, as this can damage the movement.
- Pull the crown out to position 2 (second click) to set the time. The second hand will stop. Turn the crown to move the hour and minute hands to the desired time. Ensure you differentiate between AM and PM when setting the time, especially if the watch has a date function (the date changes at midnight).
- Once the time and date are set, push the crown back into position 0. If it is a screw-down crown, gently push and turn it clockwise to screw it back in tightly to ensure water resistance.
5. Operating
5.1. Wearing the Watch
Wear the watch comfortably on your wrist. The automatic movement relies on your arm's motion to keep it wound. Regular wear will ensure the watch remains powered.
5.2. Water Resistance
Your Longines Conquest watch has a water resistance rating of 300 meters (1000 feet). This makes it suitable for professional marine activity and serious surface water sports, but not saturation diving.
- Always ensure the crown is fully pushed in and screwed down (if applicable) before any contact with water.
- Do not operate the crown or pushers while the watch is submerged in water.
- After exposure to saltwater, rinse the watch with fresh water and dry it thoroughly with a soft cloth.
- Water resistance is not a permanent characteristic and may be affected by aging of gaskets or accidental shocks to the crown or pushers. It is recommended to have the water resistance checked periodically by an authorized service center.
6. Maintenance
6.1. Cleaning
To maintain the appearance of your watch:
- Wipe the case and crystal with a soft, dry cloth.
- For the stainless steel bracelet, use a soft brush and soapy water to clean it, then rinse thoroughly with fresh water and dry. Ensure the crown is screwed down before cleaning with water.
- Avoid using harsh chemicals or abrasive materials.
6.2. Storage
When not wearing your watch, store it in a cool, dry place, away from direct sunlight and strong magnetic fields. If storing for an extended period, consider a watch winder to keep the automatic movement running and lubricated.
6.3. Service
Like any precision instrument, your Longines watch requires periodic servicing to ensure optimal performance and longevity. It is recommended to have your watch inspected and serviced by an authorized Longines service center every 3 to 5 years.
7. Troubleshooting
- Watch has stopped: Manually wind the watch by turning the crown clockwise 30-40 times. If it still does not start, it may require servicing.
- Watch is running fast or slow: Minor deviations are normal for mechanical watches. However, if the deviation is significant, the watch may need demagnetization or regulation by a professional.
- Date not changing: Ensure the time is set correctly for AM/PM. If the date is set between 9 PM and 3 AM, it may not change properly. Adjust the time past 3 AM, then set the date.
- Condensation under crystal: This indicates a loss of water resistance. Immediately take the watch to an authorized service center to prevent further damage to the movement.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | L3.777.4.58.6 |
| Brand | Longines |
| Movement | Automatic |
| Case Size | 41 mm x 11.5 mm |
| Case Material | Silver-tone Stainless Steel |
| Dial Color | Black |
| Crystal | Scratch Resistant Sapphire Crystal |
| Band Material | Silver-tone Stainless Steel |
| Clasp Type | Fold Over with Push Button Release |
| Water Resistance | 300 meters / 1000 feet |
| Features | Date, Hour, Minute, Second |
9. Warranty and Support
Your Longines watch is covered by a manufacturer's warranty against manufacturing defects. Please refer to the warranty card provided with your purchase for specific terms and conditions, including the duration of the warranty.
For service, repairs, or any inquiries regarding your watch, please contact an authorized Longines service center or the retailer from whom you purchased the watch. Using unauthorized service providers may void your warranty.
For more information, visit the official Longines website or consult your local Longines boutique.
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