Hamilton Khaki Field Automatic Watch - 38mm - Blue

No, this is an automatic watch. It is powered by the movement of your wrist or by winding the crown. It does not use a battery.

The H-10 automatic movement provides an 80-hour power reserve, meaning it will continue to run for approximately 80 hours after being fully wound and taken off the wrist.

Yes, the watch has a water resistance of 100 meters, making it suitable for swimming and snorkeling. However, avoid deep-sea diving or high-velocity water activities.

Yes, the NATO strap uses standard spring bars and can be easily removed and replaced with any 20mm watch strap for customization.

The watch features a scratch-resistant sapphire crystal, which offers superior durability and clarity compared to mineral glass.

Regular wear is key. If not worn daily, wind the crown periodically. Professional servicing is recommended every 3-5 years to keep the movement in optimal condition.

The 38mm diameter is a nod to the original 1960s military watches, offering a classic and versatile size that is comfortable for many wearers and fits easily under cuffs.

Ensure the watch has been wound sufficiently by shaking it or winding the crown. If it has been unworn for over 80 hours, it will stop. Wind it and wear it for at least 8 hours a day.

Minor deviations (a few seconds per day) are normal for automatic movements. If the deviation is significant, the watch may require regulation by a qualified watchmaker. Ensure it is not exposed to strong magnetic fields.

Ensure the crown is pulled out to the correct position for setting. Refer to the specific instructions for your model, as some may have a quick-set date function that should only be used when the time is not between 9 PM and 3 AM to avoid mechanical issues.