Introduction
This manual provides essential instructions for the proper setup, operation, and maintenance of your Casio MQ27-1B Men's Analog Watch. Please read this manual thoroughly to ensure optimal performance and longevity of your timepiece.
Product Overview

Image: Front view of the Casio MQ27-1B Men's Analog Watch, featuring a black dial with gold-tone hour markers and hands, and a black resin band.
The Casio MQ27-1B is an analog watch designed for everyday wear. It features a precise Japan Quartz Movement, a durable resin case and band, and a clear 3-hand analog display. The watch is designed for simplicity and reliability.
Setup
1. Initial Inspection
Upon unpacking, inspect the watch for any visible damage. Ensure all protective films are removed from the crystal and case back.

Image: The Casio watch packaging box and a clear plastic watch display stand.
2. Setting the Time
- Pull the crown (the small knob on the side of the watch case) out to the first click position.
- Rotate the crown to move the hands and set the desired time. Ensure the hour and minute hands are correctly aligned.
- Once the time is set, push the crown back in to its normal position. The second hand will begin to move, indicating the watch is operating.
3. Adjusting the Band
The watch features a resin band with an adjustable buckle clasp. To adjust, simply thread the end of the band through the buckle and secure it at a comfortable fit around your wrist. Ensure the watch is snug but not too tight to allow for proper circulation.
Operating the Watch
Basic Timekeeping
The Casio MQ27-1B is a simple analog watch designed for accurate time display. Once the time is set, the watch will continuously display the current hour, minute, and second. No further adjustments are typically needed unless the time zone changes or the battery needs replacement.
Water Resistance
This watch has a water resistance depth of 30 meters. This means it is suitable for everyday use and can withstand splashes or brief immersion in water. It is not suitable for swimming, showering, or diving. Avoid operating the crown while the watch is wet to prevent water intrusion.
Maintenance
Cleaning
Wipe the watch case and band periodically with a soft, dry cloth to remove dirt and moisture. For stubborn dirt, a slightly damp cloth can be used, followed by a dry cloth. Avoid using chemical cleaners, as they may damage the watch's finish or materials.
Battery Replacement
The watch is powered by a SR621SW battery, with an approximate life of 2 years. When the watch stops or the second hand moves erratically, it indicates a low battery. Battery replacement should be performed by a qualified watch technician to ensure proper sealing and water resistance.
Storage
When not in use for extended periods, store the watch in a cool, dry place away from direct sunlight and extreme temperatures. Avoid placing it near strong magnetic fields, which can affect timekeeping accuracy.
Troubleshooting
- Watch not running: Check if the crown is pushed all the way in. If it is, the battery may need replacement.
- Incorrect time: Reset the time as described in the "Setting the Time" section. If the time consistently becomes incorrect, the battery may be low or the movement may require servicing.
- Condensation inside the watch: This indicates a potential breach in water resistance. Avoid further contact with water and have the watch inspected by a professional immediately.
Specifications
| Model Number | MQ27-1B |
| Movement | Japan Quartz Movement |
| Accuracy | +/-20 seconds per month |
| Display | 3 Hand Analog |
| Case Material | Resin |
| Band Material | Resin |
| Case Dimensions | 37.5 x 35.0 x 7.5mm |
| Total Weight | 19g (0.67 oz) |
| Battery Type | SR621SW |
| Battery Life | Approx. 2 years |
| Water Resistance | 30 Meters (98 Feet) |
Warranty and Support
Your Casio MQ27-1B watch is backed by a one-year limited manufacturer's warranty. For warranty claims or technical support, please refer to the warranty card included with your purchase or visit the official Casio website for contact information.
For additional information or assistance, please visit the Casio Store on Amazon.


