What is a bumper automatic movement?
A bumper is a type of watch movement found only in vintage watches. It is similar to the rotor automatic which winds the watch based on the wearer’s movements. The difference with the bumper automatic is the weight may have only a 180 degree or less path of movement rather than a full 360 degree rotation. This results in the rotor hitting a small bumper at each end of its path of travel, providing a slight but distinct bumping feeling on the wrist when the wearer makes certain arm movements.
