Introduction
This manual provides essential instructions for the proper use and maintenance of your Fossil Modern Courier Chronograph Watch, Model BQ3378. Please read this guide thoroughly to ensure optimal performance and longevity of your timepiece.

This image shows the front view of the Fossil Modern Courier Chronograph Watch in gold-tone. The watch features a gold dial with Roman numerals and three sub-dials for chronograph functions. The bezel is adorned with crystals, and the watch is fitted with a gold-tone stainless steel bracelet.
Setup
1. Setting the Time
- Pull out the crown: Gently pull the crown (center knob on the right side of the watch case) to position 2.
- Adjust the time: Turn the crown clockwise or counter-clockwise to set the hour and minute hands to the correct time.
- Push in the crown: Once the time is set, push the crown back into position 1 to start the watch.
2. Adjusting the Bracelet
The stainless steel bracelet can be adjusted for a comfortable fit. This typically involves removing or adding links. It is recommended to have this procedure performed by a qualified jeweler or watch technician to prevent damage to the bracelet or clasp.

This image displays a side profile of the Fossil Modern Courier Chronograph Watch. It highlights the crown for time adjustment and the two pushers used to operate the chronograph functions, all in a matching gold-tone finish.
Operating the Chronograph
Your watch features a chronograph function for measuring elapsed time. The chronograph is operated using the two pushers located on the side of the watch case, above and below the crown.
1. Starting and Stopping the Chronograph
- To Start: Press the top pusher (A). The chronograph second hand will begin to move.
- To Stop: Press the top pusher (A) again. The chronograph second hand will stop, indicating the elapsed time.
2. Resetting the Chronograph
- To Reset: After stopping the chronograph, press the bottom pusher (B). All chronograph hands will return to their zero positions.
3. Reading the Chronograph Sub-dials
The watch features three sub-dials:
- Left Sub-dial: Chronograph minute counter.
- Bottom Sub-dial: Chronograph hour counter (or running seconds for main time, depending on specific movement).
- Right Sub-dial: 24-hour indicator (or running seconds for main time, depending on specific movement).
Refer to the specific movement details for precise sub-dial functions if different from standard chronograph layout.
Maintenance
1. Cleaning Your Watch
- Wipe the watch case and bracelet regularly with a soft, dry cloth to remove dust and dirt.
- For stainless steel, a slightly damp cloth can be used, followed by a dry cloth. Avoid harsh chemicals or abrasive materials.
2. Battery Replacement
Your watch is powered by a quartz movement requiring a product-specific battery. When the watch stops running, the battery needs to be replaced. It is highly recommended to have battery replacement performed by an authorized Fossil service center or a professional watchmaker to ensure proper sealing and maintain water resistance.
3. Water Resistance
This watch is water resistant to 50 meters (165 feet). This rating makes it suitable for short periods of recreational swimming and showering. It is not suitable for diving, snorkeling, or high-impact water sports. Always ensure the crown is fully pushed in before any contact with water.
4. Storage
When not wearing your watch, store it in a cool, dry place, away from direct sunlight and extreme temperatures. Keep it away from magnetic fields, which can affect the accuracy of the quartz movement.
Troubleshooting
- Watch not running: Check if the crown is fully pushed in. If the watch still does not run, the battery may need replacement.
- Time is inaccurate: Ensure the crown is fully pushed in. If the time continues to be inaccurate, the watch may require servicing or a battery replacement. Exposure to strong magnetic fields can also affect accuracy.
- Chronograph hands do not reset to zero: If the chronograph hands do not return to their 12 o'clock position after pressing the reset pusher (B), the watch may need adjustment or servicing.
For issues not resolved by these steps, please contact Fossil customer support or an authorized service center.
Specifications
| Feature | Detail |
|---|---|
| Model Number | BQ3378 |
| Case Diameter | 40 mm |
| Case Thickness | 11 mm |
| Band Width | 18 mm |
| Movement | Quartz Chronograph |
| Display Type | Analog |
| Crystal Material | Mineral |
| Case Material | Stainless Steel |
| Band Material | Stainless Steel |
| Water Resistance Depth | 50 Meters (165 Feet) |
| Clasp Type | 2 Pusher Foldover Clasp |
| Battery | 1 Product Specific Battery (included) |
| Item Weight | 0.55 Pounds (approx. 8.8 ounces) |
Warranty Information
Your Fossil Modern Courier Chronograph Watch is covered by a manufacturer's warranty. The terms and duration of the warranty may vary by region. Please retain your proof of purchase for warranty claims.
For detailed information regarding your warranty coverage, including specific terms and conditions, please visit the official Fossil website or contact their customer service directly.
Support and Service
Should you require assistance with your watch, including repairs, battery replacement, or general inquiries, please contact Fossil customer support.
- Online Support: Visit the official Fossil website for FAQs, service center locators, and contact information.
- Engraving Service: Fossil offers complimentary engraving at participating U.S. and Canadian full-priced and outlet Fossil stores. This service is not applicable to all accessories.
Always ensure that any servicing or repairs are carried out by authorized Fossil service centers to maintain the integrity of your watch and its warranty.