Longines Master Automatic Black Dial Men's Watch L28934516 User Manual

Introduction

This user manual provides essential information for the proper use, care, and maintenance of your Longines Master Automatic Black Dial Men's Watch, model L28934516. This timepiece combines classical elegance with exceptional quality, featuring a 42 mm stainless steel case, a black barleycorn dial, and a scratch-resistant sapphire crystal. It is powered by a Swiss automatic movement, caliber L888.5, and is water-resistant up to 30 meters (100 feet).

Front view of the Longines Master Automatic Black Dial Men's Watch, showcasing its stainless steel case, black barleycorn dial with Roman numerals, and silver-tone hands.

Setup

Initial Winding

Your Longines Master Automatic watch is powered by an automatic mechanical movement. If the watch has stopped or has not been worn for an extended period, it requires initial winding to build up its power reserve.

• To wind the watch, ensure the crown is in position 1 (fully pushed in, against the case).
• Turn the crown clockwise approximately 30-40 times. This will initiate the movement and build a sufficient power reserve.
• Once wound, the watch will continue to operate as long as it is worn regularly, as wrist movements will keep the mainspring wound.

Setting the Time and Date

1. Setting the Date: Pull the crown out to position 2. Turn the crown clockwise or counter-clockwise to adjust the date. Avoid setting the date between 9 PM and 3 AM, as this can damage the movement. If the current time falls within this period, first set the time outside this range, then set the date, and finally reset the time.
2. Setting the Time: Pull the crown out to position 3. The second hand will stop. Turn the crown to move the hour and minute hands to the desired time. To ensure accuracy, synchronize the time with a reliable time source. Push the crown back to position 1 to restart the second hand and secure the watch.

Always ensure the crown is fully pushed in after setting to maintain water resistance.

Operating Instructions

Automatic Movement

The Longines Master Automatic watch is equipped with a self-winding mechanical movement (Caliber L888.5). This movement is powered by the natural motion of your wrist. As you wear the watch, an oscillating weight inside the movement rotates, winding the mainspring and storing energy. When fully wound, the watch has a power reserve that allows it to continue running for a period even when not worn.

Rear view of the watch, showing the exhibition caseback which allows viewing of the automatic mechanical movement (Caliber L888.5).

Water Resistance

This watch is water-resistant up to 30 meters (100 feet). This rating means the watch is suitable for everyday use and can withstand splashes or brief immersion in water. It is not suitable for swimming, showering, diving, or any water sports. Always ensure the crown is fully pushed in to maintain water resistance.

Maintenance and Care

Cleaning Your Watch

To maintain the appearance of your watch, regularly clean the case and metal bracelet with a soft, dry cloth. For more thorough cleaning, especially for the metal bracelet, a soft brush and mild soapy water can be used, provided the crown is fully pushed in and the watch's water resistance is intact. Rinse thoroughly with clean water and dry immediately with a soft cloth. Avoid using harsh chemicals or abrasive materials.

Sapphire Crystal Care

The watch features a scratch-resistant sapphire crystal. While highly durable, it is not entirely scratch-proof. Avoid contact with extremely hard or abrasive surfaces to prevent potential damage.

Service and Storage

For optimal performance and longevity, it is recommended to have your automatic watch serviced by an authorized Longines service center every 3-5 years. When not wearing your watch, store it in its original box or a watch winder to keep the movement running and lubricated.

Side view of the watch, highlighting the case profile and the stainless steel bracelet with its triple safety folding clasp.

Troubleshooting

• Watch has stopped or is running inaccurately:

  As an automatic watch, it relies on movement to stay wound. If the watch has stopped, it likely needs to be manually wound (refer to "Initial Winding" in the Setup section). If worn regularly, ensure sufficient wrist movement. If the issue persists after winding and regular wear, professional servicing may be required.

• Date is not changing at midnight:

  The watch's movement distinguishes between AM and PM. If the date changes at noon instead of midnight, the time is set 12 hours off. Pull the crown to position 3 and advance the time by 12 hours. Then, reset the correct time and date.

• Condensation under the crystal:

  If you notice condensation inside the watch, this indicates a breach in its water resistance. Immediately take the watch to an authorized service center to prevent further damage to the movement.

Specifications

Warranty and Support

For detailed information regarding the warranty coverage for your Longines Master Automatic watch, please refer to the warranty card or documentation provided with your purchase. Warranty terms and conditions are also available on the official Longines website.

For technical support, service inquiries, or to locate an authorized service center, please visit the official Longines website or contact their customer service department. Using unauthorized service centers may void your warranty.