U-Boat 1938 Doppiotempo 8400 Automatic Dual Time Watch User Manual

1. Introduction

Thank you for choosing the U-Boat 1938 Doppiotempo 8400 Automatic Dual Time Watch. This manual provides essential information for the proper use, setup, and maintenance of your timepiece. Please read it carefully to ensure optimal performance and longevity of your watch.

Safety Precautions

• Avoid exposing the watch to extreme temperatures, direct sunlight for prolonged periods, or strong magnetic fields.
• Do not attempt to open the watch case or remove the crown, as this may compromise its water resistance and void the warranty.
• Keep the watch away from harsh chemicals, solvents, and detergents.

2. Product Overview

The U-Boat 1938 Doppiotempo 8400 is an automatic dual time watch featuring a robust design and precise mechanics. Key features include a 43mm stainless steel case, sapphire crystal, 100-meter water resistance, and a calf leather strap.

Image: The U-Boat 1938 Doppiotempo 8400 Automatic Dual Time Watch, showcasing its black dial, dual time indicators, and left-side crown. The watch features a black calf leather strap.

Components

• Crown: Used for winding, setting time, and date. Located on the left side of the case.
• Inner Bezel: Rotatable, used for tracking a second time zone.
• Hour, Minute, Second Hands: Indicate the primary time.
• 24-Hour Indicator: Sub-dial or hand for 24-hour time display.
• Date Window: Displays the current date.
• Calf Leather Strap: Durable and comfortable for daily wear.

3. Setup

Initial Winding

Your U-Boat 1938 Doppiotempo 8400 is an automatic watch, meaning it is powered by the motion of your wrist. However, for initial setup or if the watch has stopped, it is recommended to manually wind it.

1. Ensure the crown is in position 1 (fully pushed in).
2. Turn the crown clockwise approximately 30-40 times. This will provide enough power reserve to start the watch.

Setting the Time

1. Pull the crown out to position 3 (farthest out). The second hand will stop.
2. Turn the crown to set the hour and minute hands to the desired time. Ensure the 24-hour indicator aligns correctly for AM/PM.
3. Push the crown back to position 1 to restart the watch.

Setting the Date

1. Pull the crown out to position 2 (middle position).
2. Turn the crown clockwise or counter-clockwise to set the date.
3. Important: Avoid setting the date between 9:00 PM and 3:00 AM, as this can damage the movement. If you need to set the date during this period, first adjust the time outside this range, set the date, then reset the time.
4. Push the crown back to position 1.

Setting the Dual Time (Inner Bezel)

The rotating inner bezel allows you to track a second time zone.

1. Identify the time difference between your current location and the second time zone you wish to track.
2. Rotate the inner bezel using the dedicated crown (if present, otherwise it's often linked to the main crown in a specific position or a separate pusher) until the desired hour on the bezel aligns with the current hour hand for the second time zone.
3. The inner bezel will then display the second time zone relative to your main time display.

4. Operating the Watch

Automatic Movement

Your watch is powered by an automatic mechanical movement. It winds itself with the natural motion of your wrist. If worn daily for at least 8-10 hours, it should maintain sufficient power reserve. If the watch is not worn for an extended period, it will stop and require manual winding as described in the 'Initial Winding' section.

Reading Dual Time

Once the inner bezel is set, you can read the second time zone by observing the hour hand's position relative to the numbers on the inner bezel.

24-Hour Indicator

The 24-hour indicator helps distinguish between AM and PM for the primary time display, which is particularly useful when setting the date to avoid changing it at midnight instead of noon.

5. Maintenance

Water Resistance (100 meters / 10 ATM)

Your watch is water resistant to 100 meters (10 ATM). This means it is suitable for swimming, snorkeling, and showering. However, it is not suitable for scuba diving or high-impact water sports. Always ensure the crown is fully pushed in before any contact with water.

• Do not operate the crown or pushers while the watch is wet or submerged.
• Avoid exposing the watch to hot water, steam, or sudden temperature changes, as this can compromise the seals.
• After exposure to saltwater, rinse the watch with fresh water and dry it thoroughly with a soft cloth.

Cleaning

To maintain the appearance of your watch, wipe the case and crystal with a soft, dry, lint-free cloth. For the leather strap, avoid excessive moisture and clean with a specialized leather cleaner if necessary.

Storage

When not wearing your watch, store it in a cool, dry place, away from direct sunlight, extreme temperatures, and strong magnetic fields. A watch winder can be used to keep the automatic movement running if you do not wear it regularly.

6. Troubleshooting

7. Specifications

• Model Number: 8400
• Movement: Automatic
• Case Material: Stainless Steel
• Case Diameter: 43mm
• Crystal: Sapphire Crystal
• Strap Material: Calf Leather
• Water Resistance: 100 meters (10 ATM)
• Functions: Dual Time, Date Display, 24-Hour Indicator, Rotating Inner Bezel

8. Warranty and Support

Manufacturer's Warranty

This U-Boat 1938 Doppiotempo 8400 watch comes with a 2-year manufacturer's official warranty from the date of purchase. The warranty covers manufacturing defects under normal use. It does not cover damage resulting from improper use, accidents, unauthorized repairs, or normal wear and tear.

Customer Support

For warranty claims, service, or any questions regarding your watch, please contact your authorized U-Boat dealer or visit the official U-Boat website for service center information.