Imagine making a device that won’t ever need charged or a new battery. What would it look like? What would it do? Well, that’s exactly the thought behind automatic watches. The self-winding timepieces keep working through everyday use and the wearer’s natural motion.  A bumper movement is a type of self-winding, automatic movement. However, unlike a modern automatic, which has the rotor spins a full 360 degrees, a bumper moves back.. Read More