The S300 series is a classic watch with a high-beat 4Hz movement. It means that the second hand of the watch tics 8 times within a second instead of the normal one tic per second. On top of the hi-beat movement, the watch comes equipped with 5 ATM water resistance and Hardlex mineral glass. The simplicity of the dial and design makes the SL300 an extremely versatile all-around watch. If you are looking for a simple watch with a clear representation of time that doesn't require a battery to work, the Airmaster S300 series is definitely for you.
1 Year international warranty
No battery needed
Water resistance: 5 ATM
Power reserve: 40 Hours
Dial diameter: 40mm
Case material:Stainless steel
Case thickness: 12mm
Time accuracy: +/- 4 Seconds a day
Window material: Hardlex mineral glass
Movement: Automatic self-wind
Band material:Genuine leather
Band width: 18mm
Band length: 23cm
Maintenance of a hand wind watch
The Automatic Airmaster SL300 is an automatic self-wind mechanical watch, which means that it doesn't require a battery. Hand-wound watches need to be winded before use. After the first winding, the watch will keep moving and winds itself automatically from natural hand movement if used at least 8 hours during the day.
How to wind a hand-wound watch?
Pull out the crown
Screw the crown anti-clockwise to the current time
Push the crown back
Turn the crown clockwise until you feel the resistance (about 10-15 rounds)
Stop winding the watch when you feel the resistance. If you overwind the watch, the spring might break.