The T620 series consists of a durable stainless steel watch strap combined with a colored dial. The watch operates fully automatically and doesn't require a battery to run. The sufficient power reserve of 30 hours will easily get you through the day. Natural hand movement will keep the watch going and, if necessary, it can be easily manually winded. The classic watch design is what makes the T620 series a great choice for a classy gentleman. As additional features, the watch is 3 ATM water resistant and the dial is made of Hardlex, an anti-scratch material.
The Automatic Chronometer T620 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.
Stop winding the watch when you feel the resistance. If you overwind the watch, the spring might break.